diff --git a/modules/openapi-generator/src/main/resources/typescript/api/api.mustache b/modules/openapi-generator/src/main/resources/typescript/api/api.mustache
index 4ccded577e47..0ca805593105 100644
--- a/modules/openapi-generator/src/main/resources/typescript/api/api.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript/api/api.mustache
@@ -1,7 +1,7 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi{{extensionForDeno}}';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi{{extensionForDeno}}';
 import {Configuration} from '../configuration{{extensionForDeno}}';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http{{extensionForDeno}}';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http{{extensionForDeno}}';
 {{#platforms}}
 {{#node}}
 import * as FormData from "form-data";
@@ -11,6 +11,7 @@ import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer{{extensionForDeno}}';
 import {ApiException} from './exception{{extensionForDeno}}';
 import {canConsumeForm, isCodeInRange} from '../util{{extensionForDeno}}';
+import {SecurityAuthentication} from '../auth/auth';
 
 {{#useInversify}}
 import { injectable } from "inversify";
@@ -151,15 +152,22 @@ export class {{classname}}RequestFactory extends BaseAPIRequestFactory {
         {{/bodyParam}}
 
         {{#hasAuthMethods}}
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         {{/hasAuthMethods}}
         {{#authMethods}}
         // Apply auth methods
         authMethod = _config.authMethods["{{name}}"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
         {{/authMethods}}
+        
+        {{^useInversify}}
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
+        {{/useInversify}}
 
         return requestContext;
     }
diff --git a/modules/openapi-generator/src/main/resources/typescript/auth/auth.mustache b/modules/openapi-generator/src/main/resources/typescript/auth/auth.mustache
index bfb303e741ed..09ff0ca2bb9a 100644
--- a/modules/openapi-generator/src/main/resources/typescript/auth/auth.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript/auth/auth.mustache
@@ -107,6 +107,9 @@ export class {{#lambda.pascalcase}}{{name}}{{/lambda.pascalcase}}Authentication
 {{/authMethods}}
 
 export type AuthMethods = {
+    {{^useInversify}}
+    "default"?: SecurityAuthentication,
+    {{/useInversify}}
     {{#authMethods}}
     "{{name}}"?: SecurityAuthentication{{^-last}},{{/-last}}
     {{/authMethods}}
@@ -114,6 +117,9 @@ export type AuthMethods = {
 {{#useInversify}}
 
 export const authMethodServices = {
+    {{^useInversify}}
+    "default"?: SecurityAuthentication,
+    {{/useInversify}}
     {{#authMethods}}
     "{{name}}": {{#lambda.pascalcase}}{{name}}{{/lambda.pascalcase}}Authentication{{^-last}},{{/-last}}
     {{/authMethods}}
@@ -126,6 +132,9 @@ export type HttpBearerConfiguration = { tokenProvider: TokenProvider };
 export type OAuth2Configuration = { accessToken: string };
 
 export type AuthMethodsConfiguration = {
+    {{^useInversify}}
+    "default"?: SecurityAuthentication,
+    {{/useInversify}}
     {{#authMethods}}
     "{{name}}"?: {{#isApiKey}}ApiKeyConfiguration{{/isApiKey}}{{#isBasicBasic}}HttpBasicConfiguration{{/isBasicBasic}}{{#isBasicBearer}}HttpBearerConfiguration{{/isBasicBearer}}{{#isOAuth}}OAuth2Configuration{{/isOAuth}}{{^-last}},{{/-last}}
     {{/authMethods}}
@@ -141,6 +150,9 @@ export function configureAuthMethods(config: AuthMethodsConfiguration | undefine
     if (!config) {
         return authMethods;
     }
+    {{^useInversify}}
+    authMethods["default"] = config["default"]
+    {{/useInversify}}
 
     {{#authMethods}}
     if (config["{{name}}"]) {
diff --git a/modules/openapi-generator/src/main/resources/typescript/types/ObjectParamAPI.mustache b/modules/openapi-generator/src/main/resources/typescript/types/ObjectParamAPI.mustache
index d44164bd0191..9a6390337188 100644
--- a/modules/openapi-generator/src/main/resources/typescript/types/ObjectParamAPI.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript/types/ObjectParamAPI.mustache
@@ -47,7 +47,7 @@ export class Object{{classname}} {
      {{/summary}}
      * @param param the request object
      */
-    public {{nickname}}(param: {{classname}}{{operationIdCamelCase}}Request, options?: Configuration): {{#useRxJS}}Observable{{/useRxJS}}{{^useRxJS}}Promise{{/useRxJS}}<{{{returnType}}}{{^returnType}}void{{/returnType}}> {
+    public {{nickname}}(param: {{classname}}{{operationIdCamelCase}}Request{{^hasRequiredParams}} = {}{{/hasRequiredParams}}, options?: Configuration): {{#useRxJS}}Observable{{/useRxJS}}{{^useRxJS}}Promise{{/useRxJS}}<{{{returnType}}}{{^returnType}}void{{/returnType}}> {
         return this.api.{{nickname}}({{#allParams}}param.{{paramName}}, {{/allParams}} options){{^useRxJS}}.toPromise(){{/useRxJS}};
     }
 
diff --git a/samples/openapi3/client/petstore/typescript/builds/composed-schemas/apis/DefaultApi.ts b/samples/openapi3/client/petstore/typescript/builds/composed-schemas/apis/DefaultApi.ts
index 59a3ac169736..a2c52ae901ea 100644
--- a/samples/openapi3/client/petstore/typescript/builds/composed-schemas/apis/DefaultApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/composed-schemas/apis/DefaultApi.ts
@@ -1,10 +1,11 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { Cat } from '../models/Cat';
@@ -44,6 +45,11 @@ export class DefaultApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -74,6 +80,11 @@ export class DefaultApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -104,6 +115,11 @@ export class DefaultApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/composed-schemas/auth/auth.ts b/samples/openapi3/client/petstore/typescript/builds/composed-schemas/auth/auth.ts
index fa859aaa0981..49340932e11b 100644
--- a/samples/openapi3/client/petstore/typescript/builds/composed-schemas/auth/auth.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/composed-schemas/auth/auth.ts
@@ -24,6 +24,7 @@ export interface TokenProvider {
 
 
 export type AuthMethods = {
+    "default"?: SecurityAuthentication,
 }
 
 export type ApiKeyConfiguration = string;
@@ -32,6 +33,7 @@ export type HttpBearerConfiguration = { tokenProvider: TokenProvider };
 export type OAuth2Configuration = { accessToken: string };
 
 export type AuthMethodsConfiguration = {
+    "default"?: SecurityAuthentication,
 }
 
 /**
@@ -44,6 +46,7 @@ export function configureAuthMethods(config: AuthMethodsConfiguration | undefine
     if (!config) {
         return authMethods;
     }
+    authMethods["default"] = config["default"]
 
     return authMethods;
 }
\ No newline at end of file
diff --git a/samples/openapi3/client/petstore/typescript/builds/composed-schemas/types/ObjectParamAPI.ts b/samples/openapi3/client/petstore/typescript/builds/composed-schemas/types/ObjectParamAPI.ts
index d94a613229e6..84ebc7d8c699 100644
--- a/samples/openapi3/client/petstore/typescript/builds/composed-schemas/types/ObjectParamAPI.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/composed-schemas/types/ObjectParamAPI.ts
@@ -50,21 +50,21 @@ export class ObjectDefaultApi {
     /**
      * @param param the request object
      */
-    public filePost(param: DefaultApiFilePostRequest, options?: Configuration): Promise<void> {
+    public filePost(param: DefaultApiFilePostRequest = {}, options?: Configuration): Promise<void> {
         return this.api.filePost(param.inlineObject,  options).toPromise();
     }
 
     /**
      * @param param the request object
      */
-    public petsFilteredPatch(param: DefaultApiPetsFilteredPatchRequest, options?: Configuration): Promise<void> {
+    public petsFilteredPatch(param: DefaultApiPetsFilteredPatchRequest = {}, options?: Configuration): Promise<void> {
         return this.api.petsFilteredPatch(param.petByAgePetByType,  options).toPromise();
     }
 
     /**
      * @param param the request object
      */
-    public petsPatch(param: DefaultApiPetsPatchRequest, options?: Configuration): Promise<void> {
+    public petsPatch(param: DefaultApiPetsPatchRequest = {}, options?: Configuration): Promise<void> {
         return this.api.petsPatch(param.catDog,  options).toPromise();
     }
 
diff --git a/samples/openapi3/client/petstore/typescript/builds/default/apis/PetApi.ts b/samples/openapi3/client/petstore/typescript/builds/default/apis/PetApi.ts
index ff3b13bc8455..e85797baebc1 100644
--- a/samples/openapi3/client/petstore/typescript/builds/default/apis/PetApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/default/apis/PetApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { ApiResponse } from '../models/ApiResponse';
@@ -51,11 +52,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -88,11 +94,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("api_key", ObjectSerializer.serialize(apiKey, "string", ""));
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -125,11 +136,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -162,11 +178,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -195,11 +216,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -239,11 +265,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -304,11 +335,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -371,11 +407,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/default/apis/StoreApi.ts b/samples/openapi3/client/petstore/typescript/builds/default/apis/StoreApi.ts
index 46cf6d33efc7..821e181892ba 100644
--- a/samples/openapi3/client/petstore/typescript/builds/default/apis/StoreApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/default/apis/StoreApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { Order } from '../models/Order';
@@ -39,6 +40,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -58,11 +64,16 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -91,6 +102,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -127,6 +143,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/default/apis/UserApi.ts b/samples/openapi3/client/petstore/typescript/builds/default/apis/UserApi.ts
index 99a7c43b2e5c..9a87f64e9c58 100644
--- a/samples/openapi3/client/petstore/typescript/builds/default/apis/UserApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/default/apis/UserApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { User } from '../models/User';
@@ -49,11 +50,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -91,11 +97,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -133,11 +144,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -166,11 +182,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -198,6 +219,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -240,6 +266,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -258,11 +289,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -309,11 +345,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/default/auth/auth.ts b/samples/openapi3/client/petstore/typescript/builds/default/auth/auth.ts
index 1f1d1ecac678..a67ed0e90ccb 100644
--- a/samples/openapi3/client/petstore/typescript/builds/default/auth/auth.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/default/auth/auth.ts
@@ -66,6 +66,7 @@ export class PetstoreAuthAuthentication implements SecurityAuthentication {
 
 
 export type AuthMethods = {
+    "default"?: SecurityAuthentication,
     "api_key"?: SecurityAuthentication,
     "petstore_auth"?: SecurityAuthentication
 }
@@ -76,6 +77,7 @@ export type HttpBearerConfiguration = { tokenProvider: TokenProvider };
 export type OAuth2Configuration = { accessToken: string };
 
 export type AuthMethodsConfiguration = {
+    "default"?: SecurityAuthentication,
     "api_key"?: ApiKeyConfiguration,
     "petstore_auth"?: OAuth2Configuration
 }
@@ -90,6 +92,7 @@ export function configureAuthMethods(config: AuthMethodsConfiguration | undefine
     if (!config) {
         return authMethods;
     }
+    authMethods["default"] = config["default"]
 
     if (config["api_key"]) {
         authMethods["api_key"] = new ApiKeyAuthentication(
diff --git a/samples/openapi3/client/petstore/typescript/builds/default/types/ObjectParamAPI.ts b/samples/openapi3/client/petstore/typescript/builds/default/types/ObjectParamAPI.ts
index 829c9d0363a8..a590e3ca4923 100644
--- a/samples/openapi3/client/petstore/typescript/builds/default/types/ObjectParamAPI.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/default/types/ObjectParamAPI.ts
@@ -244,7 +244,7 @@ export class ObjectStoreApi {
      * Returns pet inventories by status
      * @param param the request object
      */
-    public getInventory(param: StoreApiGetInventoryRequest, options?: Configuration): Promise<{ [key: string]: number; }> {
+    public getInventory(param: StoreApiGetInventoryRequest = {}, options?: Configuration): Promise<{ [key: string]: number; }> {
         return this.api.getInventory( options).toPromise();
     }
 
@@ -409,7 +409,7 @@ export class ObjectUserApi {
      * Logs out current logged in user session
      * @param param the request object
      */
-    public logoutUser(param: UserApiLogoutUserRequest, options?: Configuration): Promise<void> {
+    public logoutUser(param: UserApiLogoutUserRequest = {}, options?: Configuration): Promise<void> {
         return this.api.logoutUser( options).toPromise();
     }
 
diff --git a/samples/openapi3/client/petstore/typescript/builds/deno/apis/PetApi.ts b/samples/openapi3/client/petstore/typescript/builds/deno/apis/PetApi.ts
index 9ae92b9b2120..f11b208baf24 100644
--- a/samples/openapi3/client/petstore/typescript/builds/deno/apis/PetApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/deno/apis/PetApi.ts
@@ -1,10 +1,11 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi.ts';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi.ts';
 import {Configuration} from '../configuration.ts';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http.ts';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http.ts';
 import {ObjectSerializer} from '../models/ObjectSerializer.ts';
 import {ApiException} from './exception.ts';
 import {canConsumeForm, isCodeInRange} from '../util.ts';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { ApiResponse } from '../models/ApiResponse.ts';
@@ -49,11 +50,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -86,11 +92,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("api_key", ObjectSerializer.serialize(apiKey, "string", ""));
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -123,11 +134,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -160,11 +176,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -193,11 +214,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -237,11 +263,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -302,11 +333,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -369,11 +405,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/deno/apis/StoreApi.ts b/samples/openapi3/client/petstore/typescript/builds/deno/apis/StoreApi.ts
index 767734aed21e..f83700b35cfb 100644
--- a/samples/openapi3/client/petstore/typescript/builds/deno/apis/StoreApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/deno/apis/StoreApi.ts
@@ -1,10 +1,11 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi.ts';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi.ts';
 import {Configuration} from '../configuration.ts';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http.ts';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http.ts';
 import {ObjectSerializer} from '../models/ObjectSerializer.ts';
 import {ApiException} from './exception.ts';
 import {canConsumeForm, isCodeInRange} from '../util.ts';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { Order } from '../models/Order.ts';
@@ -37,6 +38,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -56,11 +62,16 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -89,6 +100,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -125,6 +141,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/deno/apis/UserApi.ts b/samples/openapi3/client/petstore/typescript/builds/deno/apis/UserApi.ts
index 7caf789d015d..f2de9aeb598a 100644
--- a/samples/openapi3/client/petstore/typescript/builds/deno/apis/UserApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/deno/apis/UserApi.ts
@@ -1,10 +1,11 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi.ts';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi.ts';
 import {Configuration} from '../configuration.ts';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http.ts';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http.ts';
 import {ObjectSerializer} from '../models/ObjectSerializer.ts';
 import {ApiException} from './exception.ts';
 import {canConsumeForm, isCodeInRange} from '../util.ts';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { User } from '../models/User.ts';
@@ -47,11 +48,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -89,11 +95,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -131,11 +142,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -164,11 +180,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -196,6 +217,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -238,6 +264,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -256,11 +287,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -307,11 +343,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/deno/auth/auth.ts b/samples/openapi3/client/petstore/typescript/builds/deno/auth/auth.ts
index e7609dabbece..85086dde5fae 100644
--- a/samples/openapi3/client/petstore/typescript/builds/deno/auth/auth.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/deno/auth/auth.ts
@@ -64,6 +64,7 @@ export class PetstoreAuthAuthentication implements SecurityAuthentication {
 
 
 export type AuthMethods = {
+    "default"?: SecurityAuthentication,
     "api_key"?: SecurityAuthentication,
     "petstore_auth"?: SecurityAuthentication
 }
@@ -74,6 +75,7 @@ export type HttpBearerConfiguration = { tokenProvider: TokenProvider };
 export type OAuth2Configuration = { accessToken: string };
 
 export type AuthMethodsConfiguration = {
+    "default"?: SecurityAuthentication,
     "api_key"?: ApiKeyConfiguration,
     "petstore_auth"?: OAuth2Configuration
 }
@@ -88,6 +90,7 @@ export function configureAuthMethods(config: AuthMethodsConfiguration | undefine
     if (!config) {
         return authMethods;
     }
+    authMethods["default"] = config["default"]
 
     if (config["api_key"]) {
         authMethods["api_key"] = new ApiKeyAuthentication(
diff --git a/samples/openapi3/client/petstore/typescript/builds/deno/types/ObjectParamAPI.ts b/samples/openapi3/client/petstore/typescript/builds/deno/types/ObjectParamAPI.ts
index ebcd714f27c5..a6988e3ef191 100644
--- a/samples/openapi3/client/petstore/typescript/builds/deno/types/ObjectParamAPI.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/deno/types/ObjectParamAPI.ts
@@ -244,7 +244,7 @@ export class ObjectStoreApi {
      * Returns pet inventories by status
      * @param param the request object
      */
-    public getInventory(param: StoreApiGetInventoryRequest, options?: Configuration): Promise<{ [key: string]: number; }> {
+    public getInventory(param: StoreApiGetInventoryRequest = {}, options?: Configuration): Promise<{ [key: string]: number; }> {
         return this.api.getInventory( options).toPromise();
     }
 
@@ -409,7 +409,7 @@ export class ObjectUserApi {
      * Logs out current logged in user session
      * @param param the request object
      */
-    public logoutUser(param: UserApiLogoutUserRequest, options?: Configuration): Promise<void> {
+    public logoutUser(param: UserApiLogoutUserRequest = {}, options?: Configuration): Promise<void> {
         return this.api.logoutUser( options).toPromise();
     }
 
diff --git a/samples/openapi3/client/petstore/typescript/builds/inversify/apis/PetApi.ts b/samples/openapi3/client/petstore/typescript/builds/inversify/apis/PetApi.ts
index 9b8cd23af11e..81a75d96bcec 100644
--- a/samples/openapi3/client/petstore/typescript/builds/inversify/apis/PetApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/inversify/apis/PetApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 import { injectable } from "inversify";
 
@@ -53,12 +54,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -90,12 +92,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("api_key", ObjectSerializer.serialize(apiKey, "string", ""));
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -127,12 +130,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -164,12 +168,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -197,12 +202,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -241,12 +247,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -306,12 +313,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -373,12 +381,13 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/inversify/apis/StoreApi.ts b/samples/openapi3/client/petstore/typescript/builds/inversify/apis/StoreApi.ts
index 356d2cfbc4d0..4115b9dc6d9e 100644
--- a/samples/openapi3/client/petstore/typescript/builds/inversify/apis/StoreApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/inversify/apis/StoreApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 import { injectable } from "inversify";
 
@@ -41,6 +42,7 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
 
         return requestContext;
     }
@@ -60,12 +62,13 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -93,6 +96,7 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
 
         return requestContext;
     }
@@ -129,6 +133,7 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/inversify/apis/UserApi.ts b/samples/openapi3/client/petstore/typescript/builds/inversify/apis/UserApi.ts
index 3991a33b383b..124034df9888 100644
--- a/samples/openapi3/client/petstore/typescript/builds/inversify/apis/UserApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/inversify/apis/UserApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 import { injectable } from "inversify";
 
@@ -51,12 +52,13 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -93,12 +95,13 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -135,12 +138,13 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -168,12 +172,13 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -200,6 +205,7 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
 
         return requestContext;
     }
@@ -242,6 +248,7 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
+        
 
         return requestContext;
     }
@@ -260,12 +267,13 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
@@ -311,12 +319,13 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
         }
+        
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/inversify/types/ObjectParamAPI.ts b/samples/openapi3/client/petstore/typescript/builds/inversify/types/ObjectParamAPI.ts
index 829c9d0363a8..a590e3ca4923 100644
--- a/samples/openapi3/client/petstore/typescript/builds/inversify/types/ObjectParamAPI.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/inversify/types/ObjectParamAPI.ts
@@ -244,7 +244,7 @@ export class ObjectStoreApi {
      * Returns pet inventories by status
      * @param param the request object
      */
-    public getInventory(param: StoreApiGetInventoryRequest, options?: Configuration): Promise<{ [key: string]: number; }> {
+    public getInventory(param: StoreApiGetInventoryRequest = {}, options?: Configuration): Promise<{ [key: string]: number; }> {
         return this.api.getInventory( options).toPromise();
     }
 
@@ -409,7 +409,7 @@ export class ObjectUserApi {
      * Logs out current logged in user session
      * @param param the request object
      */
-    public logoutUser(param: UserApiLogoutUserRequest, options?: Configuration): Promise<void> {
+    public logoutUser(param: UserApiLogoutUserRequest = {}, options?: Configuration): Promise<void> {
         return this.api.logoutUser( options).toPromise();
     }
 
diff --git a/samples/openapi3/client/petstore/typescript/builds/jquery/apis/PetApi.ts b/samples/openapi3/client/petstore/typescript/builds/jquery/apis/PetApi.ts
index a2b9813749e5..fe20e750a839 100644
--- a/samples/openapi3/client/petstore/typescript/builds/jquery/apis/PetApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/jquery/apis/PetApi.ts
@@ -1,10 +1,11 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { ApiResponse } from '../models/ApiResponse';
@@ -49,11 +50,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -86,11 +92,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("api_key", ObjectSerializer.serialize(apiKey, "string", ""));
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -123,11 +134,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -160,11 +176,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -193,11 +214,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -237,11 +263,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -302,11 +333,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -369,11 +405,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/jquery/apis/StoreApi.ts b/samples/openapi3/client/petstore/typescript/builds/jquery/apis/StoreApi.ts
index a8bc438d420d..020bb0407068 100644
--- a/samples/openapi3/client/petstore/typescript/builds/jquery/apis/StoreApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/jquery/apis/StoreApi.ts
@@ -1,10 +1,11 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { Order } from '../models/Order';
@@ -37,6 +38,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -56,11 +62,16 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -89,6 +100,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -125,6 +141,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/jquery/apis/UserApi.ts b/samples/openapi3/client/petstore/typescript/builds/jquery/apis/UserApi.ts
index 3f493441c39d..75cb0453992e 100644
--- a/samples/openapi3/client/petstore/typescript/builds/jquery/apis/UserApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/jquery/apis/UserApi.ts
@@ -1,10 +1,11 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { User } from '../models/User';
@@ -47,11 +48,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -89,11 +95,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -131,11 +142,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -164,11 +180,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -196,6 +217,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -238,6 +264,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -256,11 +287,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -307,11 +343,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/jquery/auth/auth.ts b/samples/openapi3/client/petstore/typescript/builds/jquery/auth/auth.ts
index d8924a4216c2..ed2aa2bfe6db 100644
--- a/samples/openapi3/client/petstore/typescript/builds/jquery/auth/auth.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/jquery/auth/auth.ts
@@ -64,6 +64,7 @@ export class PetstoreAuthAuthentication implements SecurityAuthentication {
 
 
 export type AuthMethods = {
+    "default"?: SecurityAuthentication,
     "api_key"?: SecurityAuthentication,
     "petstore_auth"?: SecurityAuthentication
 }
@@ -74,6 +75,7 @@ export type HttpBearerConfiguration = { tokenProvider: TokenProvider };
 export type OAuth2Configuration = { accessToken: string };
 
 export type AuthMethodsConfiguration = {
+    "default"?: SecurityAuthentication,
     "api_key"?: ApiKeyConfiguration,
     "petstore_auth"?: OAuth2Configuration
 }
@@ -88,6 +90,7 @@ export function configureAuthMethods(config: AuthMethodsConfiguration | undefine
     if (!config) {
         return authMethods;
     }
+    authMethods["default"] = config["default"]
 
     if (config["api_key"]) {
         authMethods["api_key"] = new ApiKeyAuthentication(
diff --git a/samples/openapi3/client/petstore/typescript/builds/jquery/types/ObjectParamAPI.ts b/samples/openapi3/client/petstore/typescript/builds/jquery/types/ObjectParamAPI.ts
index 829c9d0363a8..a590e3ca4923 100644
--- a/samples/openapi3/client/petstore/typescript/builds/jquery/types/ObjectParamAPI.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/jquery/types/ObjectParamAPI.ts
@@ -244,7 +244,7 @@ export class ObjectStoreApi {
      * Returns pet inventories by status
      * @param param the request object
      */
-    public getInventory(param: StoreApiGetInventoryRequest, options?: Configuration): Promise<{ [key: string]: number; }> {
+    public getInventory(param: StoreApiGetInventoryRequest = {}, options?: Configuration): Promise<{ [key: string]: number; }> {
         return this.api.getInventory( options).toPromise();
     }
 
@@ -409,7 +409,7 @@ export class ObjectUserApi {
      * Logs out current logged in user session
      * @param param the request object
      */
-    public logoutUser(param: UserApiLogoutUserRequest, options?: Configuration): Promise<void> {
+    public logoutUser(param: UserApiLogoutUserRequest = {}, options?: Configuration): Promise<void> {
         return this.api.logoutUser( options).toPromise();
     }
 
diff --git a/samples/openapi3/client/petstore/typescript/builds/object_params/apis/PetApi.ts b/samples/openapi3/client/petstore/typescript/builds/object_params/apis/PetApi.ts
index ff3b13bc8455..e85797baebc1 100644
--- a/samples/openapi3/client/petstore/typescript/builds/object_params/apis/PetApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/object_params/apis/PetApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { ApiResponse } from '../models/ApiResponse';
@@ -51,11 +52,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -88,11 +94,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("api_key", ObjectSerializer.serialize(apiKey, "string", ""));
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -125,11 +136,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -162,11 +178,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -195,11 +216,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -239,11 +265,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -304,11 +335,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -371,11 +407,16 @@ export class PetApiRequestFactory extends BaseAPIRequestFactory {
             requestContext.setHeaderParam("Content-Type", contentType);
         }
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["petstore_auth"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/object_params/apis/StoreApi.ts b/samples/openapi3/client/petstore/typescript/builds/object_params/apis/StoreApi.ts
index 46cf6d33efc7..821e181892ba 100644
--- a/samples/openapi3/client/petstore/typescript/builds/object_params/apis/StoreApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/object_params/apis/StoreApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { Order } from '../models/Order';
@@ -39,6 +40,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -58,11 +64,16 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -91,6 +102,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -127,6 +143,11 @@ export class StoreApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
diff --git a/samples/openapi3/client/petstore/typescript/builds/object_params/apis/UserApi.ts b/samples/openapi3/client/petstore/typescript/builds/object_params/apis/UserApi.ts
index 99a7c43b2e5c..9a87f64e9c58 100644
--- a/samples/openapi3/client/petstore/typescript/builds/object_params/apis/UserApi.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/object_params/apis/UserApi.ts
@@ -1,12 +1,13 @@
 // TODO: better import syntax?
-import { BaseAPIRequestFactory, RequiredError } from './baseapi';
+import {BaseAPIRequestFactory, RequiredError} from './baseapi';
 import {Configuration} from '../configuration';
-import { RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
+import {RequestContext, HttpMethod, ResponseContext, HttpFile} from '../http/http';
 import * as FormData from "form-data";
 import { URLSearchParams } from 'url';
 import {ObjectSerializer} from '../models/ObjectSerializer';
 import {ApiException} from './exception';
 import {canConsumeForm, isCodeInRange} from '../util';
+import {SecurityAuthentication} from '../auth/auth';
 
 
 import { User } from '../models/User';
@@ -49,11 +50,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -91,11 +97,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -133,11 +144,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -166,11 +182,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -198,6 +219,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -240,6 +266,11 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         }
 
 
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
+        }
 
         return requestContext;
     }
@@ -258,11 +289,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         requestContext.setHeaderParam("Accept", "application/json, */*;q=0.8")
 
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
@@ -309,11 +345,16 @@ export class UserApiRequestFactory extends BaseAPIRequestFactory {
         );
         requestContext.setBody(serializedBody);
 
-        let authMethod = null;
+        let authMethod: SecurityAuthentication | undefined;
         // Apply auth methods
         authMethod = _config.authMethods["api_key"]
-        if (authMethod) {
-            await authMethod.applySecurityAuthentication(requestContext);
+        if (authMethod?.applySecurityAuthentication) {
+            await authMethod?.applySecurityAuthentication(requestContext);
+        }
+        
+        const defaultAuth: SecurityAuthentication | undefined = _options?.authMethods?.default || this.configuration?.authMethods?.default
+        if (defaultAuth?.applySecurityAuthentication) {
+            await defaultAuth?.applySecurityAuthentication(requestContext);
         }
 
         return requestContext;
diff --git a/samples/openapi3/client/petstore/typescript/builds/object_params/auth/auth.ts b/samples/openapi3/client/petstore/typescript/builds/object_params/auth/auth.ts
index 1f1d1ecac678..a67ed0e90ccb 100644
--- a/samples/openapi3/client/petstore/typescript/builds/object_params/auth/auth.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/object_params/auth/auth.ts
@@ -66,6 +66,7 @@ export class PetstoreAuthAuthentication implements SecurityAuthentication {
 
 
 export type AuthMethods = {
+    "default"?: SecurityAuthentication,
     "api_key"?: SecurityAuthentication,
     "petstore_auth"?: SecurityAuthentication
 }
@@ -76,6 +77,7 @@ export type HttpBearerConfiguration = { tokenProvider: TokenProvider };
 export type OAuth2Configuration = { accessToken: string };
 
 export type AuthMethodsConfiguration = {
+    "default"?: SecurityAuthentication,
     "api_key"?: ApiKeyConfiguration,
     "petstore_auth"?: OAuth2Configuration
 }
@@ -90,6 +92,7 @@ export function configureAuthMethods(config: AuthMethodsConfiguration | undefine
     if (!config) {
         return authMethods;
     }
+    authMethods["default"] = config["default"]
 
     if (config["api_key"]) {
         authMethods["api_key"] = new ApiKeyAuthentication(
diff --git a/samples/openapi3/client/petstore/typescript/builds/object_params/types/ObjectParamAPI.ts b/samples/openapi3/client/petstore/typescript/builds/object_params/types/ObjectParamAPI.ts
index 829c9d0363a8..a590e3ca4923 100644
--- a/samples/openapi3/client/petstore/typescript/builds/object_params/types/ObjectParamAPI.ts
+++ b/samples/openapi3/client/petstore/typescript/builds/object_params/types/ObjectParamAPI.ts
@@ -244,7 +244,7 @@ export class ObjectStoreApi {
      * Returns pet inventories by status
      * @param param the request object
      */
-    public getInventory(param: StoreApiGetInventoryRequest, options?: Configuration): Promise<{ [key: string]: number; }> {
+    public getInventory(param: StoreApiGetInventoryRequest = {}, options?: Configuration): Promise<{ [key: string]: number; }> {
         return this.api.getInventory( options).toPromise();
     }
 
@@ -409,7 +409,7 @@ export class ObjectUserApi {
      * Logs out current logged in user session
      * @param param the request object
      */
-    public logoutUser(param: UserApiLogoutUserRequest, options?: Configuration): Promise<void> {
+    public logoutUser(param: UserApiLogoutUserRequest = {}, options?: Configuration): Promise<void> {
         return this.api.logoutUser( options).toPromise();
     }