Fix decline reason

Author: armando-rodriguez-cko

src/CheckoutSdk/Issuing/Transactions/Responses/Messages.cs

@@ -17,7 +17,7 @@ public class Messages
 
         public IndicatorType? Indicator { get; set; }
 
-        public string DeclinedReason { get; set; }
+        public string DeclineReason { get; set; }
 
         public long? BillingAmount { get; set; }
 

test/CheckoutSdkTest/CheckoutSdkTest.csproj

@@ -41,6 +41,9 @@
         <None Update="Resources\KnetResponse.json">
           <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         </None>
+        <None Update="Resources\IssuingTransactionsDeclinedReason.json">
+          <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </None>
     </ItemGroup>
     <ItemGroup>
         <Content Include="Resources\AppSettingsPreviousTest.json">

test/CheckoutSdkTest/JsonSerializerTest.cs

@@ -6,6 +6,7 @@
 using Checkout.Issuing.Controls;
 using Checkout.Issuing.Controls.Requests.Create;
 using Checkout.Issuing.Controls.Responses.Create;
+using Checkout.Issuing.Transactions.Responses;
 using Checkout.Payments.Contexts;
 using Checkout.Payments.Response;
 using Checkout.Payments.Response.Source;
@@ -119,6 +120,17 @@ public void ShouldDeserializeDefaultCardCTypeResponse()
             cardDetailsResponse.Type.ShouldBe(CardType.Physical);
         }
 
+        [Fact]
+        public void ShouldDeserializeIssuingTransactionsDeclinedReasonResponse()
+        {
+            var fileContent = GetJsonFileContent("./Resources/IssuingTransactionsDeclinedReason.json");
+            Messages messages =
+                (Messages)new JsonSerializer().Deserialize(fileContent,
+                    typeof(Messages));
+            messages.ShouldNotBeNull();
+            messages.DeclineReason.ShouldBe("velocity_reached");
+        }
+        
         [Fact]
         public void ShouldDeserializeKnetResponse()
         {

test/CheckoutSdkTest/Resources/IssuingTransactionsDeclinedReason.json

@@ -0,0 +1,12 @@
+{
+  "id": "msg_abatreternbygkaeqqter6gs4de",
+  "initiator": "cardholder",
+  "type": "authorization",
+  "result": "declined",
+  "is_relayed": false,
+  "indicator": "normal_authorization",
+  "decline_reason": "velocity_reached",
+  "billing_amount": 1000056,
+  "billing_currency": "GBP",
+  "created_on": "2025-04-07T11:48:57.0000000Z"
+}