chore(ACL-107): Add metadata to GetPayoutsResponse (#222)

Author: tl-Roberto-Mancinelli

src/TrueLayer/Payouts/Model/GetPayoutsResponse.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Text.Json.Serialization;
 using OneOf;
 using TrueLayer.Serialization;
@@ -61,6 +62,11 @@ public record PayoutDetails
             /// Gets the scheme id
             /// </summary>
             public string? SchemeId { get; init; } = null;
+
+            /// <summary>
+            /// Gets metadata of the payout
+            /// </summary>
+            public Dictionary<string, string>? Metadata { get; init; }
         }
 
         /// <summary>

test/TrueLayer.AcceptanceTests/PayoutTests.cs

@@ -58,6 +58,7 @@ public async Task Can_get_payout()
             details.Beneficiary.AsT1.ShouldNotBeNull();
             details.Status.ShouldBeOneOf("pending", "authorized", "executed", "failed");
             details.CreatedAt.ShouldNotBeOneOf(DateTime.MinValue, DateTime.MaxValue);
+            details.Metadata.ShouldBe(payoutRequest.Metadata);
         }
 
         public Task DisposeAsync() => Task.CompletedTask;