feat: 취소 기능 적용

Author: ense333

src/main/java/com/threestar/trainus/domain/payment/controller/PaymentController.java

@@ -2,6 +2,7 @@
 
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;

src/main/java/com/threestar/trainus/domain/payment/service/PaymentService.java

@@ -126,7 +126,11 @@ public void processCancel(TossPaymentResponseDto tossResponseDto) {
 		TossPayment tossPayment = tossPaymentRepository.findByPaymentKey(tossResponseDto.getPaymentKey())
 			.orElseThrow(() -> new BusinessException(ErrorCode.INVALID_PAYMENT));
 
-		tossPayment.changeStatus(LocalDateTime.parse(tossResponseDto.getRequestedAt()), null, PaymentStatus.CANCELED);
+		DateTimeFormatter formatter = DateTimeFormatter.ISO_OFFSET_DATE_TIME;
+		LocalDateTime requestAt = OffsetDateTime.parse(tossResponseDto.getRequestedAt(), formatter).toLocalDateTime();
+
+
+		tossPayment.changeStatus(requestAt, null, PaymentStatus.CANCELED);
 
 		tossPaymentRepository.save(tossPayment);