Add Serializable attribute to dtos

modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestCreationDto.cs

@@ -1,10 +1,12 @@
 using JetBrains.Annotations;
+using System;
 using System.ComponentModel.DataAnnotations;
 using Volo.Abp.ObjectExtending;
 using Volo.Abp.Validation;
 
 namespace Payment.PaymentRequests
 {
+    [Serializable]
     public class PaymentRequestCreationDto : ExtensibleObject
     {
         [DynamicMaxLength(typeof(PaymentRequestConsts), nameof(PaymentRequestConsts.MaxCustomerIdLength))]

modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestDto.cs

@@ -3,6 +3,7 @@ using Volo.Abp.Application.Dtos;
 
 namespace Payment.PaymentRequests
 {
+    [Serializable]
     public class PaymentRequestDto : CreationAuditedEntityDto<Guid>
     {
         public string CustomerId { get; set; }

modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentDto.cs

@@ -4,6 +4,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Payment.PaymentRequests
 {
+    [Serializable]
     public class StartPaymentDto
     {
         public Guid PaymentRequestId { get; set; }

modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentResultDto.cs

@@ -1,5 +1,8 @@
-namespace Payment.PaymentRequests
+using System;
+
+namespace Payment.PaymentRequests
 {
+    [Serializable]
     public class StartPaymentResultDto
     {
         public string CheckoutLink { get; set; }