mall + pay：

1. 重构支付回调的逻辑，将回调解析改成 PayOrderRespDTO，为后续轮询做铺垫
2. 调整退款单的表结构
3. 调整退款调用的实现

yudao-module-pay/yudao-module-pay-api/src/main/java/cn/iocoder/yudao/module/pay/enums/refund/PayRefundStatusEnum.java

@@ -5,14 +5,18 @@ import lombok.Getter;
 
 import java.util.Objects;
 
+/**
+ * 渠道的退款状态枚举
+ *
+ * @author 芋道源码
+ */
 @Getter
 @AllArgsConstructor
 public enum PayRefundStatusEnum {
 
-    CREATE(0, "退款订单生成"),
-    SUCCESS(1, "退款成功"),
-    FAILURE(2, "退款失败"),
-    CLOSE(99, "退款关闭");
+    WAITING(0, "未退款"),
+    SUCCESS(10, "退款成功"),
+    FAILURE(20, "退款失败");
 
     private final Integer status;
     private final String name;