add

backend/src/main/java/com/car/dto/PayRequest.java

@@ -0,0 +1,13 @@
+package com.car.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import lombok.Data;
+
+@Data
+public class PayRequest {
+    @NotNull(message = "订单不能为空")
+    private Long orderId;
+    @NotBlank(message = "支付方式不能为空")
+    private String payType;
+}