diff --git a/src/main/java/co/orange/ddanzi/dto/payment/CreatePaymentResponseDto.java b/src/main/java/co/orange/ddanzi/dto/payment/CreatePaymentResponseDto.java
index 5cd35e7b..525e2fd0 100644
--- a/src/main/java/co/orange/ddanzi/dto/payment/CreatePaymentResponseDto.java
+++ b/src/main/java/co/orange/ddanzi/dto/payment/CreatePaymentResponseDto.java
@@ -9,7 +9,7 @@
 @Getter
 @Builder
 public class CreatePaymentResponseDto {
-    private Long paymentId;
+    private String paymentId;
     private PayStatus payStatus;
     private LocalDateTime startedAt;
 }
diff --git a/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentRequestDto.java b/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentRequestDto.java
index caf70034..dc46c82f 100644
--- a/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentRequestDto.java
+++ b/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentRequestDto.java
@@ -5,6 +5,6 @@
 
 @Getter
 public class UpdatePaymentRequestDto {
-    private Long paymentId;
+    private String paymentId;
     private PayStatus payStatus;
 }
diff --git a/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentResponseDto.java b/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentResponseDto.java
index 2409917e..0f108a77 100644
--- a/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentResponseDto.java
+++ b/src/main/java/co/orange/ddanzi/dto/payment/UpdatePaymentResponseDto.java
@@ -9,7 +9,7 @@
 @Getter
 @Builder
 public class UpdatePaymentResponseDto {
-    private Long paymentId;
+    private String paymentId;
     private PayStatus payStatus;
     private LocalDateTime endedAt;
 }
diff --git a/src/main/java/co/orange/ddanzi/service/PaymentService.java b/src/main/java/co/orange/ddanzi/service/PaymentService.java
index 516ae5fc..b651fc80 100644
--- a/src/main/java/co/orange/ddanzi/service/PaymentService.java
+++ b/src/main/java/co/orange/ddanzi/service/PaymentService.java
@@ -51,8 +51,10 @@ public ApiResponse<?> startPayment(CreatePaymentRequestDto requestDto){
         product.updateStock(product.getStock() - 1);
         log.info("Update stock of product, product_id: {}", product.getId());
 
+        ///////////////////////////////////////////////////////////////////////////////////////////
+        // 형변환 해놨음 다시 수정필요
         CreatePaymentResponseDto responseDto = CreatePaymentResponseDto.builder()
-                .paymentId(payment.getId())
+                .paymentId(payment.getId().toString())
                 .payStatus(payment.getPayStatus())
                 .startedAt(payment.getStartedAt())
                 .build();
@@ -61,8 +63,9 @@ public ApiResponse<?> startPayment(CreatePaymentRequestDto requestDto){
 
     @Transactional
     public ApiResponse<?> endPayment(UpdatePaymentRequestDto requestDto){
-
-        Payment payment = paymentRepository.findById(requestDto.getPaymentId()).orElseThrow(()-> new PaymentNotFoundException());
+        ///////////////////////////////////////////////////////////////////////////////////////////
+        // 형변환 해놨음 다시 수정필요
+        Payment payment = paymentRepository.findById(Long.parseLong(requestDto.getPaymentId())).orElseThrow(()-> new PaymentNotFoundException());
         Item item = payment.getItem();
         Product product = item.getProduct();
 
@@ -79,9 +82,10 @@ public ApiResponse<?> endPayment(UpdatePaymentRequestDto requestDto){
             product.updateStock(product.getStock() + 1);
         }
 
-
+        ///////////////////////////////////////////////////////////////////////////////////////////
+        // 형변환 해놨음 다시 수정필요
         UpdatePaymentResponseDto responseDto = UpdatePaymentResponseDto.builder()
-                .paymentId(payment.getId())
+                .paymentId(payment.getId().toString())
                 .payStatus(payment.getPayStatus())
                 .endedAt(payment.getEndedAt())
                 .build();