mall + pay：

1. 优化 PayClient 退款逻辑，返回业务失败 errorCode + errorMsg 错误码

yudao-framework/yudao-spring-boot-starter-biz-pay/src/main/java/cn/iocoder/yudao/framework/pay/core/enums/refund/PayRefundStatusRespEnum.java

@@ -25,4 +25,8 @@ public enum PayRefundStatusRespEnum {
         return Objects.equals(status, SUCCESS.getStatus());
     }
 
+    public static boolean isFailure(Integer status) {
+        return Objects.equals(status, FAILURE.getStatus());
+    }
+
 }