diff --git a/Vonage.Test/NumberInsightsV2/FraudCheck/SerializationTest.cs b/Vonage.Test/NumberInsightsV2/FraudCheck/SerializationTest.cs
index 8498400b3..bca8866fe 100644
--- a/Vonage.Test/NumberInsightsV2/FraudCheck/SerializationTest.cs
+++ b/Vonage.Test/NumberInsightsV2/FraudCheck/SerializationTest.cs
@@ -14,80 +14,82 @@ public class SerializationTest
     private readonly SerializationTestHelper helper = new SerializationTestHelper(
         typeof(SerializationTest).Namespace,
         JsonSerializerBuilder.BuildWithSnakeCase());
-
+    
     [Fact]
     public void ShouldDeserialize200() => this.helper.Serializer
         .DeserializeObject<FraudCheckResponse>(this.helper.GetResponseJson())
         .Should()
         .BeSuccess(GetExpectedFraudCheckResponse());
-
+    
     [Fact]
     public void ShouldDeserialize200WithoutFraudScore() => this.helper.Serializer
         .DeserializeObject<FraudCheckResponse>(this.helper.GetResponseJson())
         .Should()
         .BeSuccess(GetExpectedFraudCheckResponseWithoutFraudScore());
-
+    
     [Fact]
     public void ShouldDeserialize200WithoutSimSwap() => this.helper.Serializer
         .DeserializeObject<FraudCheckResponse>(this.helper.GetResponseJson())
         .Should()
         .BeSuccess(GetExpectedFraudCheckResponseWithoutSimSwap());
-
+    
     [Fact]
     public void ShouldSerializeWithFraudScore() => BuildRequestWithFraudScore()
         .GetStringContent()
         .Should()
         .BeSuccess(this.helper.GetRequestJson());
-
+    
     [Fact]
     public void ShouldSerializeWithFraudScoreAndSimSwap() => BuildRequestWithFraudScoreAndSimSwap()
         .GetStringContent()
         .Should()
         .BeSuccess(this.helper.GetRequestJson());
-
+    
     [Fact]
     public void ShouldSerializeWithSimSwap() => BuildRequestWithSimSwap()
         .GetStringContent()
         .Should()
         .BeSuccess(this.helper.GetRequestJson());
-
+    
     private static FraudCheckResponse GetExpectedFraudCheckResponseWithoutFraudScore() => new FraudCheckResponse(
         new Guid("6cb4c489-0fc8-4c40-8c3d-95e7e74f9450"),
         "phone",
         new PhoneData("16197363066", "Orange France", "MOBILE"),
         Maybe<FraudScore>.None,
-        Maybe<SimSwap>.Some(new SimSwap(SimSwapStatus.Completed, true, "Mobile Network Operator Not Supported")));
-
+        Maybe<NumberInsightV2.FraudCheck.SimSwap>.Some(new NumberInsightV2.FraudCheck.SimSwap(SimSwapStatus.Completed,
+            true, "Mobile Network Operator Not Supported")));
+    
     private static FraudCheckResponse GetExpectedFraudCheckResponseWithoutSimSwap() => new FraudCheckResponse(
         new Guid("6cb4c489-0fc8-4c40-8c3d-95e7e74f9450"),
         "phone",
         new PhoneData("16197363066", "Orange France", "MOBILE"),
         Maybe<FraudScore>.Some(new FraudScore("54", RiskRecommendation.Block, FraudScoreLabel.Low, "completed")),
-        Maybe<SimSwap>.None);
-
+        Maybe<NumberInsightV2.FraudCheck.SimSwap>.None);
+    
     internal static Result<FraudCheckRequest> BuildRequestWithFraudScore() =>
         FraudCheckRequest.Build()
             .WithPhone("447009000000")
             .WithFraudScore()
             .Create();
-
+    
     internal static Result<FraudCheckRequest> BuildRequestWithFraudScoreAndSimSwap() =>
         FraudCheckRequest.Build()
             .WithPhone("447009000000")
             .WithFraudScore()
             .WithSimSwap()
             .Create();
-
+    
     internal static Result<FraudCheckRequest> BuildRequestWithSimSwap() =>
         FraudCheckRequest.Build()
             .WithPhone("447009000000")
             .WithSimSwap()
             .Create();
-
+    
     internal static FraudCheckResponse GetExpectedFraudCheckResponse() => new FraudCheckResponse(
         new Guid("6cb4c489-0fc8-4c40-8c3d-95e7e74f9450"),
         "phone",
         new PhoneData("16197363066", "Orange France", "MOBILE"),
         Maybe<FraudScore>.Some(new FraudScore("54", RiskRecommendation.Flag, FraudScoreLabel.Medium, "completed")),
-        Maybe<SimSwap>.Some(new SimSwap(SimSwapStatus.Failed, true, "Mobile Network Operator Not Supported")));
+        Maybe<NumberInsightV2.FraudCheck.SimSwap>.Some(new NumberInsightV2.FraudCheck.SimSwap(SimSwapStatus.Failed,
+            true, "Mobile Network Operator Not Supported")));
 }
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/AuthenticateRequest.cs b/Vonage.Test/SimSwap/Authenticate/AuthenticateRequest.cs
new file mode 100644
index 000000000..0c9a13331
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/AuthenticateRequest.cs
@@ -0,0 +1,68 @@
+using FluentAssertions;
+using Vonage.Common.Failures;
+using Vonage.Test.Common.Extensions;
+using Xunit;
+
+namespace Vonage.Test.SimSwap.Authenticate;
+
+[Trait("Category", "Request")]
+public class AuthenticateRequest
+{
+    [Theory]
+    [InlineData("")]
+    [InlineData(" ")]
+    [InlineData(null)]
+    public void Parse_ShouldReturnFailure_GivenNumberIsNullOrWhitespace(string value) =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse(value).Should()
+            .BeFailure(ResultFailure.FromErrorMessage("Number cannot be null or whitespace."));
+    
+    [Fact]
+    public void Parse_ShouldReturnNumberWithPlusIndicator() =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456789")
+            .Map(number => number.PhoneNumber.NumberWithInternationalIndicator)
+            .Should()
+            .BeSuccess("+123456789");
+    
+    [Fact]
+    public void Parse_ShouldReturnFailure_GivenNumberContainsNonDigits() =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("1234567abc123").Should()
+            .BeFailure(ResultFailure.FromErrorMessage("Number can only contain digits."));
+    
+    [Fact]
+    public void Parse_ShouldReturnFailure_GivenNumberLengthIsHigherThan7() =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456").Should()
+            .BeFailure(ResultFailure.FromErrorMessage("Number length cannot be lower than 7."));
+    
+    [Fact]
+    public void Parse_ShouldReturnFailure_GivenNumberLengthIsLowerThan15() =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("1234567890123456").Should()
+            .BeFailure(ResultFailure.FromErrorMessage("Number length cannot be higher than 15."));
+    
+    [Theory]
+    [InlineData("1234567", "1234567")]
+    [InlineData("123456789012345", "123456789012345")]
+    public void Parse_ShouldReturnSuccess_GivenNumberIsValid(string value, string expected) =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse(value).Map(number => number.PhoneNumber.Number).Should()
+            .BeSuccess(expected);
+    
+    [Theory]
+    [InlineData("+1234567890", "1234567890")]
+    [InlineData("+123456789012345", "123456789012345")]
+    [InlineData("+++1234567890", "1234567890")]
+    public void Parse_ShouldReturnSuccess_GivenNumberStartWithPlus(string value, string expected) =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse(value).Map(number => number.PhoneNumber.Number).Should()
+            .BeSuccess(expected);
+    
+    [Fact]
+    public void ToString_ShouldReturnNumber() =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456789").Map(number => number.PhoneNumber.ToString())
+            .Should()
+            .BeSuccess("123456789");
+    
+    [Fact]
+    public void BuildAuthorizeRequest()
+    {
+        var request = Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456789").GetSuccessUnsafe();
+        request.BuildAuthorizeRequest().Number.Should().Be(request.PhoneNumber);
+    }
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/AuthorizeRequestTest.cs b/Vonage.Test/SimSwap/Authenticate/AuthorizeRequestTest.cs
new file mode 100644
index 000000000..f8becb43f
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/AuthorizeRequestTest.cs
@@ -0,0 +1,15 @@
+using Vonage.Test.Common.Extensions;
+using Xunit;
+
+namespace Vonage.Test.SimSwap.Authenticate;
+
+[Trait("Category", "Request")]
+public class AuthorizeRequestTest
+{
+    [Fact]
+    public void GetEndpointPath_ShouldReturnApiEndpoint() =>
+        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456789")
+            .Map(request => request.BuildAuthorizeRequest())
+            .Map(r => r.GetEndpointPath())
+            .Should().BeSuccess("oauth2/bc-authorize");
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/AuthorizeResponseTest.cs b/Vonage.Test/SimSwap/Authenticate/AuthorizeResponseTest.cs
new file mode 100644
index 000000000..8dfb76070
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/AuthorizeResponseTest.cs
@@ -0,0 +1,15 @@
+using FluentAssertions;
+using Vonage.SimSwap.Authenticate;
+using Xunit;
+
+namespace Vonage.Test.SimSwap.Authenticate;
+
+[Trait("Category", "Request")]
+public class AuthorizeResponseTest
+{
+    [Fact]
+    public void BuildGetTokenRequest() =>
+        new AuthorizeResponse("123456", "0", "0")
+            .BuildGetTokenRequest()
+            .Should().Be(new GetTokenRequest("123456"));
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/Data/ShouldDeserializeAccessToken-response.json b/Vonage.Test/SimSwap/Authenticate/Data/ShouldDeserializeAccessToken-response.json
new file mode 100644
index 000000000..73ab58daa
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/Data/ShouldDeserializeAccessToken-response.json
@@ -0,0 +1,5 @@
+{
+  "access_token": "ABCDEFG",
+  "token_type": "Bearer",
+  "expires_in": 3600
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/Data/ShouldDeserializeAuthorize-response.json b/Vonage.Test/SimSwap/Authenticate/Data/ShouldDeserializeAuthorize-response.json
new file mode 100644
index 000000000..7b4249193
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/Data/ShouldDeserializeAuthorize-response.json
@@ -0,0 +1,5 @@
+{
+  "auth_req_id": "123456789",
+  "expires_in": "120",
+  "interval": "2"
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/E2ETest.cs b/Vonage.Test/SimSwap/Authenticate/E2ETest.cs
new file mode 100644
index 000000000..7ab8df50c
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/E2ETest.cs
@@ -0,0 +1,40 @@
+using System.Net;
+using System.Threading.Tasks;
+using Vonage.SimSwap.Authenticate;
+using Vonage.Test.Common.Extensions;
+using WireMock.ResponseBuilders;
+using Xunit;
+
+namespace Vonage.Test.SimSwap.Authenticate;
+
+[Trait("Category", "E2E")]
+public class E2ETest : E2EBase
+{
+    public E2ETest() : base(typeof(E2ETest).Namespace)
+    {
+    }
+    
+    [Fact]
+    public async Task Authenticate()
+    {
+        this.Helper.Server.Given(WireMock.RequestBuilders.Request.Create()
+                .WithPath("/oauth2/bc-authorize")
+                .WithHeader("Authorization", this.Helper.ExpectedAuthorizationHeaderValue)
+                .WithBody(
+                    "login_hint=tel:%2B447700900000&scope=openid+dpv%3AFraudPreventionAndDetection%23check-sim-swap")
+                .UsingPost())
+            .RespondWith(Response.Create().WithStatusCode(HttpStatusCode.OK)
+                .WithBody(this.Serialization.GetResponseJson(nameof(SerializationTest.ShouldDeserializeAuthorize))));
+        this.Helper.Server.Given(WireMock.RequestBuilders.Request.Create()
+                .WithPath("/oauth2/token")
+                .WithHeader("Authorization", this.Helper.ExpectedAuthorizationHeaderValue)
+                .WithBody("auth_req_id=123456789&grant_type=urn:openid:params:grant-type:ciba")
+                .UsingPost())
+            .RespondWith(Response.Create().WithStatusCode(HttpStatusCode.OK)
+                .WithBody(this.Serialization.GetResponseJson(nameof(SerializationTest.ShouldDeserializeAccessToken))));
+        await this.Helper.VonageClient.SimSwapClient
+            .AuthenticateAsync(Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("447700900000"))
+            .Should()
+            .BeSuccessAsync(new AuthenticateResponse("ABCDEFG"));
+    }
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/GetTokenRequestTest.cs b/Vonage.Test/SimSwap/Authenticate/GetTokenRequestTest.cs
new file mode 100644
index 000000000..c621ea673
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/GetTokenRequestTest.cs
@@ -0,0 +1,13 @@
+using FluentAssertions;
+using Vonage.SimSwap.Authenticate;
+using Xunit;
+
+namespace Vonage.Test.SimSwap.Authenticate;
+
+[Trait("Category", "Request")]
+public class GetTokenRequestTest
+{
+    [Fact]
+    public void GetEndpointPath_ShouldReturnApiEndpoint() =>
+        new GetTokenRequest("123456").GetEndpointPath().Should().Be("oauth2/token");
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/SerializationTest.cs b/Vonage.Test/SimSwap/Authenticate/SerializationTest.cs
new file mode 100644
index 000000000..69395a3a3
--- /dev/null
+++ b/Vonage.Test/SimSwap/Authenticate/SerializationTest.cs
@@ -0,0 +1,31 @@
+using Vonage.Serialization;
+using Vonage.SimSwap.Authenticate;
+using Vonage.Test.Common;
+using Vonage.Test.Common.Extensions;
+using Xunit;
+
+namespace Vonage.Test.SimSwap.Authenticate;
+
+[Trait("Category", "Serialization")]
+public class SerializationTest
+{
+    private readonly SerializationTestHelper helper = new SerializationTestHelper(
+        typeof(SerializationTest).Namespace,
+        JsonSerializerBuilder.BuildWithSnakeCase());
+    
+    [Fact]
+    public void ShouldDeserializeAuthorize() => this.helper.Serializer
+        .DeserializeObject<AuthorizeResponse>(this.helper.GetResponseJson())
+        .Should()
+        .BeSuccess(GetExpectedAuthorizeResponse());
+    
+    [Fact]
+    public void ShouldDeserializeAccessToken() => this.helper.Serializer
+        .DeserializeObject<GetTokenResponse>(this.helper.GetResponseJson())
+        .Should()
+        .BeSuccess(GetExpectedTokenResponse());
+    
+    internal static AuthorizeResponse GetExpectedAuthorizeResponse() => new AuthorizeResponse("123456789", "120", "2");
+    
+    internal static GetTokenResponse GetExpectedTokenResponse() => new GetTokenResponse("ABCDEFG", "Bearer", 3600);
+}
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/E2EBase.cs b/Vonage.Test/SimSwap/E2EBase.cs
new file mode 100644
index 000000000..10d16354b
--- /dev/null
+++ b/Vonage.Test/SimSwap/E2EBase.cs
@@ -0,0 +1,16 @@
+using Vonage.Serialization;
+using Vonage.Test.Common;
+using Vonage.Test.TestHelpers;
+
+namespace Vonage.Test.SimSwap;
+
+public class E2EBase
+{
+    internal readonly TestingContext Helper;
+    internal readonly SerializationTestHelper Serialization;
+    
+    protected E2EBase(string serializationNamespace) : this() => this.Serialization =
+        new SerializationTestHelper(serializationNamespace, JsonSerializerBuilder.BuildWithSnakeCase());
+    
+    protected E2EBase() => this.Helper = TestingContext.WithBearerCredentials("Url.Api.EMEA");
+}
\ No newline at end of file
diff --git a/Vonage.Test/Vonage.Test.csproj b/Vonage.Test/Vonage.Test.csproj
index 472a4a1b4..d9279e5b4 100644
--- a/Vonage.Test/Vonage.Test.csproj
+++ b/Vonage.Test/Vonage.Test.csproj
@@ -47,6 +47,7 @@
     </ItemGroup>
 
     <ItemGroup>
+        <Folder Include="SimSwap\Check\"/>
         <None Update="Data\NccoTests\TestRecord-request.json">
             <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         </None>
@@ -1101,6 +1102,12 @@
         <None Update="Data\Webhooks\ShouldDeserializedAnswered_GivenStartTimeIsNull.json">
             <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         </None>
+        <None Update="SimSwap\Authenticate\Data\ShouldDeserializeAuthorize-response.json">
+            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        </None>
+        <None Update="SimSwap\Authenticate\Data\ShouldDeserializeAccessToken-response.json">
+            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        </None>
     </ItemGroup>
     <Target Name="PreBuild" BeforeTargets="PreBuildEvent">
         <Exec Command="node ../.scripts/init.js"/>
diff --git a/Vonage/SimSwap/Authenticate/AuthenticateRequest.cs b/Vonage/SimSwap/Authenticate/AuthenticateRequest.cs
new file mode 100644
index 000000000..240a42fcd
--- /dev/null
+++ b/Vonage/SimSwap/Authenticate/AuthenticateRequest.cs
@@ -0,0 +1,28 @@
+using Vonage.Common;
+using Vonage.Common.Monads;
+
+namespace Vonage.SimSwap.Authenticate;
+
+/// <summary>
+///     Represents a request to authenticate towards SimSwap API.
+/// </summary>
+public readonly struct AuthenticateRequest
+{
+    /// <summary>
+    ///     Parses the input into an AuthenticateRequest.
+    /// </summary>
+    /// <param name="number">The phone number.</param>
+    /// <returns>Success if the input matches all requirements. Failure otherwise.</returns>
+    public static Result<AuthenticateRequest> Parse(string number) =>
+        PhoneNumber.Parse(number).Map(phoneNumber => new AuthenticateRequest
+        {
+            PhoneNumber = phoneNumber,
+        });
+    
+    /// <summary>
+    ///     Subscriber number in E.164 format (starting with country code). Optionally prefixed with '+'.
+    /// </summary>
+    public PhoneNumber PhoneNumber { get; private init; }
+    
+    internal AuthorizeRequest BuildAuthorizeRequest() => new AuthorizeRequest(this.PhoneNumber);
+}
\ No newline at end of file
diff --git a/Vonage/SimSwap/Authenticate/AuthenticateResponse.cs b/Vonage/SimSwap/Authenticate/AuthenticateResponse.cs
new file mode 100644
index 000000000..4e95dd510
--- /dev/null
+++ b/Vonage/SimSwap/Authenticate/AuthenticateResponse.cs
@@ -0,0 +1,7 @@
+namespace Vonage.SimSwap.Authenticate;
+
+/// <summary>
+///     Represents an authentication response.
+/// </summary>
+/// <param name="AccessToken">The access token.</param>
+public record AuthenticateResponse(string AccessToken);
\ No newline at end of file
diff --git a/Vonage/SimSwap/Authenticate/AuthorizeRequest.cs b/Vonage/SimSwap/Authenticate/AuthorizeRequest.cs
new file mode 100644
index 000000000..2037bc124
--- /dev/null
+++ b/Vonage/SimSwap/Authenticate/AuthorizeRequest.cs
@@ -0,0 +1,31 @@
+using System.Net;
+using System.Net.Http;
+using System.Text;
+using Vonage.Common;
+using Vonage.Common.Client;
+
+namespace Vonage.SimSwap.Authenticate;
+
+internal record AuthorizeRequest(PhoneNumber Number) : IVonageRequest
+{
+    public string GetEndpointPath() => "oauth2/bc-authorize";
+    
+    public HttpRequestMessage BuildRequestMessage() =>
+        VonageRequestBuilder
+            .Initialize(HttpMethod.Post, this.GetEndpointPath())
+            .WithContent(this.GetRequestContent())
+            .Build();
+    
+    private string GetUrlEncoded()
+    {
+        var builder = new StringBuilder();
+        builder.Append("login_hint=tel:");
+        builder.Append(WebUtility.UrlEncode(this.Number.NumberWithInternationalIndicator));
+        builder.Append("&scope=");
+        builder.Append(WebUtility.UrlEncode("openid dpv:FraudPreventionAndDetection#check-sim-swap"));
+        return builder.ToString();
+    }
+    
+    private StringContent GetRequestContent() =>
+        new StringContent(this.GetUrlEncoded(), Encoding.UTF8, "application/x-www-form-urlencoded");
+}
\ No newline at end of file
diff --git a/Vonage/SimSwap/Authenticate/AuthorizeResponse.cs b/Vonage/SimSwap/Authenticate/AuthorizeResponse.cs
new file mode 100644
index 000000000..1149b0647
--- /dev/null
+++ b/Vonage/SimSwap/Authenticate/AuthorizeResponse.cs
@@ -0,0 +1,14 @@
+using System.Text.Json.Serialization;
+
+namespace Vonage.SimSwap.Authenticate;
+
+internal record AuthorizeResponse(
+    [property: JsonPropertyName("auth_req_id")]
+    string RequestId,
+    [property: JsonPropertyName("expires_in")]
+    string ExpiresIn,
+    [property: JsonPropertyName("interval")]
+    string Interval)
+{
+    internal GetTokenRequest BuildGetTokenRequest() => new GetTokenRequest(this.RequestId);
+}
\ No newline at end of file
diff --git a/Vonage/SimSwap/Authenticate/GetTokenRequest.cs b/Vonage/SimSwap/Authenticate/GetTokenRequest.cs
new file mode 100644
index 000000000..3fa69a61a
--- /dev/null
+++ b/Vonage/SimSwap/Authenticate/GetTokenRequest.cs
@@ -0,0 +1,29 @@
+using System.Net;
+using System.Net.Http;
+using System.Text;
+using Vonage.Common.Client;
+
+namespace Vonage.SimSwap.Authenticate;
+
+internal record GetTokenRequest(string RequestId) : IVonageRequest
+{
+    public HttpRequestMessage BuildRequestMessage() =>
+        VonageRequestBuilder
+            .Initialize(HttpMethod.Post, this.GetEndpointPath())
+            .WithContent(this.GetRequestContent())
+            .Build();
+    
+    public string GetEndpointPath() => "oauth2/token";
+    
+    private string GetUrlEncoded()
+    {
+        var builder = new StringBuilder();
+        builder.Append("auth_req_id=");
+        builder.Append(WebUtility.UrlEncode(this.RequestId));
+        builder.Append("&grant_type=urn:openid:params:grant-type:ciba");
+        return builder.ToString();
+    }
+    
+    private StringContent GetRequestContent() =>
+        new StringContent(this.GetUrlEncoded(), Encoding.UTF8, "application/x-www-form-urlencoded");
+}
\ No newline at end of file
diff --git a/Vonage/SimSwap/Authenticate/GetTokenResponse.cs b/Vonage/SimSwap/Authenticate/GetTokenResponse.cs
new file mode 100644
index 000000000..75e045c96
--- /dev/null
+++ b/Vonage/SimSwap/Authenticate/GetTokenResponse.cs
@@ -0,0 +1,11 @@
+using System.Text.Json.Serialization;
+
+namespace Vonage.SimSwap.Authenticate;
+
+internal record GetTokenResponse(
+    [property: JsonPropertyName("access_token")]
+    string AccessToken,
+    [property: JsonPropertyName("token_type")]
+    string TokenType,
+    [property: JsonPropertyName("expires_in")]
+    int ExpiresIn);
\ No newline at end of file
diff --git a/Vonage/SimSwap/ISimSwapClient.cs b/Vonage/SimSwap/ISimSwapClient.cs
new file mode 100644
index 000000000..199374709
--- /dev/null
+++ b/Vonage/SimSwap/ISimSwapClient.cs
@@ -0,0 +1,18 @@
+using System.Threading.Tasks;
+using Vonage.Common.Monads;
+using Vonage.SimSwap.Authenticate;
+
+namespace Vonage.SimSwap;
+
+/// <summary>
+///     Exposes SimSwap features.
+/// </summary>
+public interface ISimSwapClient
+{
+    /// <summary>
+    ///     Authenticates towards SimSwap API to retrieve an authentication token.
+    /// </summary>
+    /// <param name="request">The request.</param>
+    /// <returns>Success or Failure.</returns>
+    Task<Result<AuthenticateResponse>> AuthenticateAsync(Result<AuthenticateRequest> request);
+}
\ No newline at end of file
diff --git a/Vonage/SimSwap/SimSwapClient.cs b/Vonage/SimSwap/SimSwapClient.cs
new file mode 100644
index 000000000..7e81a8ccf
--- /dev/null
+++ b/Vonage/SimSwap/SimSwapClient.cs
@@ -0,0 +1,38 @@
+using System.Threading.Tasks;
+using Vonage.Common.Client;
+using Vonage.Common.Monads;
+using Vonage.Serialization;
+using Vonage.SimSwap.Authenticate;
+
+namespace Vonage.SimSwap;
+
+internal class SimSwapClient : ISimSwapClient
+{
+    private readonly VonageHttpClient vonageClient;
+    
+    internal SimSwapClient(VonageHttpClientConfiguration configuration) =>
+        this.vonageClient = new VonageHttpClient(configuration, JsonSerializerBuilder.BuildWithSnakeCase());
+    
+    /// <inheritdoc />
+    /// >
+    public Task<Result<AuthenticateResponse>> AuthenticateAsync(Result<AuthenticateRequest> request) =>
+        request.Map(BuildAuthorizeRequest)
+            .BindAsync(this.SendAuthorizeRequest)
+            .Map(BuildGetTokenRequest)
+            .BindAsync(this.SendGetTokenRequest)
+            .Map(BuildAuthenticateResponse);
+    
+    private static AuthenticateResponse BuildAuthenticateResponse(GetTokenResponse response) =>
+        new AuthenticateResponse(response.AccessToken);
+    
+    private Task<Result<GetTokenResponse>> SendGetTokenRequest(GetTokenRequest request) =>
+        this.vonageClient.SendWithResponseAsync<GetTokenRequest, GetTokenResponse>(request);
+    
+    private Task<Result<AuthorizeResponse>> SendAuthorizeRequest(AuthorizeRequest request) =>
+        this.vonageClient.SendWithResponseAsync<AuthorizeRequest, AuthorizeResponse>(request);
+    
+    private static GetTokenRequest BuildGetTokenRequest(AuthorizeResponse request) => request.BuildGetTokenRequest();
+    
+    private static AuthorizeRequest BuildAuthorizeRequest(AuthenticateRequest request) =>
+        request.BuildAuthorizeRequest();
+}
\ No newline at end of file
diff --git a/Vonage/VonageClient.cs b/Vonage/VonageClient.cs
index fab0fac58..3dff90939 100644
--- a/Vonage/VonageClient.cs
+++ b/Vonage/VonageClient.cs
@@ -19,6 +19,7 @@
 using Vonage.Redaction;
 using Vonage.Request;
 using Vonage.ShortCodes;
+using Vonage.SimSwap;
 using Vonage.SubAccounts;
 using Vonage.Users;
 using Vonage.Verify;
@@ -36,37 +37,37 @@ public class VonageClient
     private readonly Maybe<Configuration> configuration = Maybe<Configuration>.None;
     private readonly ITimeProvider timeProvider = new TimeProvider();
     private Credentials credentials;
-
+    
     /// <summary>
     ///     Constructor for VonageClient.
     /// </summary>
     /// <param name="credentials">Credentials to be used for further HTTP calls.</param>
     public VonageClient(Credentials credentials) => this.Credentials = credentials;
-
+    
     internal VonageClient(Credentials credentials, Configuration configuration, ITimeProvider timeProvider)
     {
         this.timeProvider = timeProvider;
         this.configuration = configuration;
         this.Credentials = credentials;
     }
-
+    
     internal VonageClient(Configuration configuration)
     {
         this.configuration = this.GetConfiguration();
         this.Credentials = configuration.BuildCredentials();
     }
-
+    
     public IAccountClient AccountClient { get; private set; }
-
+    
     public IApplicationClient ApplicationClient { get; private set; }
-
+    
     /// <summary>
     ///     Exposes Conversations features.
     /// </summary>
     public IConversationsClient ConversationsClient { get; private set; }
-
+    
     public IConversionClient ConversionClient { get; private set; }
-
+    
     /// <summary>
     ///     Gets or sets credentials for this client.
     /// </summary>
@@ -81,65 +82,67 @@ public Credentials Credentials
             this.PropagateCredentials();
         }
     }
-
+    
     /// <summary>
     ///     Exposes Meetings features.
     /// </summary>
     public IMeetingsClient MeetingsClient { get; private set; }
-
+    
     public IMessagesClient MessagesClient { get; private set; }
-
+    
     public INumberInsightClient NumberInsightClient { get; private set; }
-
+    
     /// <summary>
     ///     Exposes Number Insight V2 features.
     /// </summary>
     public INumberInsightV2Client NumberInsightV2Client { get; private set; }
-
+    
     public INumbersClient NumbersClient { get; private set; }
-
+    
     public IPricingClient PricingClient { get; private set; }
-
+    
     /// <summary>
     ///     Exposes ProactiveConnect features.
     /// </summary>
     public IProactiveConnectClient ProactiveConnectClient { get; private set; }
-
+    
     public IRedactClient RedactClient { get; private set; }
-
+    
     public IShortCodesClient ShortCodesClient { get; private set; }
-
+    
     public ISmsClient SmsClient { get; private set; }
-
+    
     /// <summary>
     ///     Exposes SubAccounts features.
     /// </summary>
     public ISubAccountsClient SubAccountsClient { get; private set; }
-
+    
     /// <summary>
     ///     Exposes User management features.
     /// </summary>
     public IUsersClient UsersClient { get; private set; }
-
+    
     public IVerifyClient VerifyClient { get; private set; }
-
+    
     /// <summary>
     ///     Exposes VerifyV2 features.
     /// </summary>
     public IVerifyV2Client VerifyV2Client { get; private set; }
-
+    
     /// <summary>
     ///     Exposes Video features.
     /// </summary>
     public IVideoClient VideoClient { get; private set; }
-
+    
     public IVoiceClient VoiceClient { get; private set; }
-
+    
+    public ISimSwapClient SimSwapClient { get; private set; }
+    
     private VonageHttpClientConfiguration BuildConfiguration(HttpClient client) =>
         new(client, this.Credentials.GetAuthenticationHeader(), this.Credentials.GetUserAgent());
-
+    
     private Configuration GetConfiguration() => this.configuration.IfNone(Configuration.Instance);
-
+    
     private void PropagateCredentials()
     {
         var currentConfiguration = this.GetConfiguration();
@@ -167,6 +170,7 @@ private void PropagateCredentials()
         this.ConversationsClient = new ConversationsClient(nexmoConfiguration);
         this.MeetingsClient = new MeetingsClient(euConfiguration, new FileSystem());
         this.ProactiveConnectClient = new ProactiveConnectClient(euConfiguration);
+        this.SimSwapClient = new SimSwapClient(euConfiguration);
         this.VideoClient = new VideoClient(videoConfiguration);
     }
 }
\ No newline at end of file