flutter_adyen

Note: This library is not official from Adyen.

Flutter plugin to integrate with the Android and iOS libraries of Adyen. This library enables you to open the Drop-in method of Adyen with just calling one function.

• Adyen drop-in Android
• Adyen drop-in iOS

This should support One time payment and recurring payment.

Prerequisites

Before calling the plugin, make sure to get the payment methods from Adyen or better from your backend. For this, call the a /paymentMethods endpoint:

POST: https://checkout-test.adyen.com/v46/paymentMethods

// Version number might be different

Payload should contain the merchant account

{
  "merchantAccount": "<YOUR ACCOUNT>"
}

Append your API key and a content-type to the headers:

Content-Type: application/json
X-API-KEY: AQEXXXXXXXXXXXXXXXX

It's not recommended to store the API key in the front-end for security reasons!

You also need to have the:

• publicKey (from Adyen)
• merchantAccount (from Adyen)
• amount & currency
• shopperReference (e.g userId)
• reference (e.g transactionId)

Setup

Android

Add this in your android/build.gradle

implementation "com.adyen.checkout:drop-in:3.2.1"

And in the AndroidManifest.xml in your application tag add this service, this allows adyen to tell the android app the result of the payment.

<application ...>
    ...
    <service
           android:name="app.petleo.flutter_adyen.MyDropInService"
           android:permission="android.permission.BIND_JOB_SERVICE" />

</application>

Since Flutter 1.12, android release compilation defaults to R8 minify Set proguard inside android/app/build.gradle

buildTypes {
   release {
       signingConfig signingConfigs.release               
       minifyEnabled true
       useProguard true
       proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
   }
}

And add these proguard rules to android/app/proguard-rules.pro

#Flutter Wrapper
-keep class io.flutter.app.** { *; }
-keep class io.flutter.plugin.**  { *; }
-keep class io.flutter.util.**  { *; }
-keep class io.flutter.view.**  { *; }
-keep class io.flutter.**  { *; }
-keep class io.flutter.plugins.**  { *; }

# ADYEN
-keep class com.adyen.checkout.base.model.** { *; }
-keep class com.adyen.threeds2.** { *; }
-keepclassmembers public class * implements com.adyen.checkout.base.PaymentComponent {
   public <init>(...);
}

-keep class app.petleo.flutter_adyen.PaymentsRequest** {*;}

-keep class com.adyen.checkout.base.model.PaymentMethodsApiResponse** {*;}
#-keepclassmembers class com.adyen.checkout.base.model.PaymentMethodsApiResponse** {*;}

# ADYEN MOSHI
# JSR 305 annotations are for embedding nullability information.
-dontwarn javax.annotation.**

-keepclasseswithmembers class * {
    @com.squareup.moshi.* <methods>;
}

-keep @com.squareup.moshi.JsonQualifier interface *

# Enum field names are used by the integrated EnumJsonAdapter.
# values() is synthesized by the Kotlin compiler and is used by EnumJsonAdapter indirectly
# Annotate enums with @JsonClass(generateAdapter = false) to use them with Moshi.
-keepclassmembers @com.squareup.moshi.JsonClass class * extends java.lang.Enum {
    <fields>;
    **[] values();
}

# / ADYEN MOSHI

# ADYEN MOSHI KOTLIN

-keep class kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoaderImpl

-keepclassmembers class kotlin.Metadata {
    public <methods>;
}

# / ADYEN MOSHI KOTLIN

# / ADYEN 

iOS

You need to add a URL_SCHEME if you do not have one yet.

Here is how to add one.

You might need to run this command pod update Adyen/Card in your ios folder.

Usage

Just add this in your dart code

 const PAYMENT_SUCCESS = 'SUCCESS';
 const PAYMENT_CANCELLED = 'CANCELLED';
 
 String dropInResponse = await FlutterAdyen.openDropIn(
                paymentMethods: jsonEncode(examplePaymentMethods),
                baseUrl: 'https://YOURBACKEND/payment/',
                authToken: 'Bearer AAABBBCCCDDD222111',
                merchantAccount: 'YOURMERCHANTACCOUNTCOM',
                publicKey: pubKey,
                amount: '1230',
                currency: 'EUR',
                iosReturnUrl: 'YOURAPP://' <-- URL_SCHEME_FOR_YOUR_iOS_APP
                shopperReference: DateTime.now().millisecondsSinceEpoch.toString(),
                reference: DateTime.now().millisecondsSinceEpoch.toString(),
              );
              
  if(dropInResponse == 'PAYMENT_SUCCESS') ... 
  if(dropInResponse == 'PAYMENT_CANCELLED') ...
  else ... // you will get the error message here. (It is not translated to any languages)