diff --git a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestCreationDto.cs b/modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestCreationDto.cs
index f76c9bd..4be6566 100644
--- a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestCreationDto.cs
+++ b/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))]
diff --git a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestDto.cs b/modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestDto.cs
index 8e453fc..39a218d 100644
--- a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestDto.cs
+++ b/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; }
diff --git a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentDto.cs b/modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentDto.cs
index 00b1cc3..be9ca14 100644
--- a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentDto.cs
+++ b/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; }
diff --git a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentResultDto.cs b/modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentResultDto.cs
index da2be6b..3cf0d4f 100644
--- a/modules/payment/src/Payment.Application.Contracts/PaymentRequests/StartPaymentResultDto.cs
+++ b/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; }