mall + pay：

1. 增加微信退款的查询接口

yudao-framework/yudao-spring-boot-starter-biz-pay/src/main/java/cn/iocoder/yudao/framework/pay/core/client/impl/weixin/AbstractWxPayClient.java

@@ -2,10 +2,12 @@ package cn.iocoder.yudao.framework.pay.core.client.impl.weixin;
 
 import cn.hutool.core.bean.BeanUtil;
 import cn.hutool.core.codec.Base64;
+import cn.hutool.core.collection.CollUtil;
 import cn.hutool.core.date.LocalDateTimeUtil;
 import cn.hutool.core.date.TemporalAccessorUtil;
 import cn.hutool.core.util.StrUtil;
 import cn.iocoder.yudao.framework.common.util.io.FileUtils;
+import cn.iocoder.yudao.framework.common.util.object.ObjectUtils;
 import cn.iocoder.yudao.framework.pay.core.client.dto.order.PayOrderRespDTO;
 import cn.iocoder.yudao.framework.pay.core.client.dto.order.PayOrderUnifiedReqDTO;
 import cn.iocoder.yudao.framework.pay.core.client.dto.refund.PayRefundRespDTO;
@@ -16,14 +18,8 @@ import com.github.binarywang.wxpay.bean.notify.WxPayOrderNotifyResult;
 import com.github.binarywang.wxpay.bean.notify.WxPayOrderNotifyV3Result;
 import com.github.binarywang.wxpay.bean.notify.WxPayRefundNotifyResult;
 import com.github.binarywang.wxpay.bean.notify.WxPayRefundNotifyV3Result;
-import com.github.binarywang.wxpay.bean.request.WxPayOrderQueryRequest;
-import com.github.binarywang.wxpay.bean.request.WxPayOrderQueryV3Request;
-import com.github.binarywang.wxpay.bean.request.WxPayRefundRequest;
-import com.github.binarywang.wxpay.bean.request.WxPayRefundV3Request;
-import com.github.binarywang.wxpay.bean.result.WxPayOrderQueryResult;
-import com.github.binarywang.wxpay.bean.result.WxPayOrderQueryV3Result;
-import com.github.binarywang.wxpay.bean.result.WxPayRefundResult;
-import com.github.binarywang.wxpay.bean.result.WxPayRefundV3Result;
+import com.github.binarywang.wxpay.bean.request.*;
+import com.github.binarywang.wxpay.bean.result.*;
 import com.github.binarywang.wxpay.config.WxPayConfig;
 import com.github.binarywang.wxpay.exception.WxPayException;
 import com.github.binarywang.wxpay.service.WxPayService;
@@ -153,13 +149,23 @@ public abstract class AbstractWxPayClient extends AbstractPayClient<WxPayClientC
 
     @Override
     protected PayOrderRespDTO doGetOrder(String outTradeNo) throws Throwable {
-        switch (config.getApiVersion()) {
-            case API_VERSION_V2:
-                return doGetOrderV2(outTradeNo);
-            case WxPayClientConfig.API_VERSION_V3:
-                return doGetOrderV3(outTradeNo);
-            default:
-                throw new IllegalArgumentException(String.format("未知的 API 版本(%s)", config.getApiVersion()));
+        try {
+            switch (config.getApiVersion()) {
+                case API_VERSION_V2:
+                    return doGetOrderV2(outTradeNo);
+                case WxPayClientConfig.API_VERSION_V3:
+                    return doGetOrderV3(outTradeNo);
+                default:
+                    throw new IllegalArgumentException(String.format("未知的 API 版本(%s)", config.getApiVersion()));
+            }
+        } catch (WxPayException e) {
+            if (ObjectUtils.equalsAny(e.getErrCode(), "ORDERNOTEXIST", "ORDER_NOT_EXIST")) {
+                String errorCode = getErrorCode(e);
+                String errorMessage = getErrorMessage(e);
+                return PayOrderRespDTO.closedOf(errorCode, errorMessage,
+                        outTradeNo, e.getXmlString());
+            }
+            throw e;
         }
     }
 
@@ -241,7 +247,7 @@ public abstract class AbstractWxPayClient extends AbstractPayClient<WxPayClientC
         // 2.1 执行请求
         WxPayRefundResult response = client.refundV2(request);
         // 2.2 创建返回结果
-        if (Objects.equals("SUCCESS", response.getResultCode())) {
+        if (Objects.equals("SUCCESS", response.getResultCode())) { // V2 情况下，不直接返回退款成功，而是等待异步通知
             return PayRefundRespDTO.waitingOf(response.getRefundId(),
                     reqDTO.getOutRefundNo(), response);
         }
@@ -308,8 +314,80 @@ public abstract class AbstractWxPayClient extends AbstractPayClient<WxPayClientC
     }
 
     @Override
-    protected PayRefundRespDTO doGetRefund(String outTradeNo, String outRefundNo) {
-        return null;
+    protected PayRefundRespDTO doGetRefund(String outTradeNo, String outRefundNo) throws WxPayException {
+        try {
+            switch (config.getApiVersion()) {
+                case API_VERSION_V2:
+                    return doGetRefundV2(outTradeNo, outRefundNo);
+                case WxPayClientConfig.API_VERSION_V3:
+                    return doGetRefundV3(outTradeNo, outRefundNo);
+                default:
+                    throw new IllegalArgumentException(String.format("未知的 API 版本(%s)", config.getApiVersion()));
+            }
+        } catch (WxPayException e) {
+            if (ObjectUtils.equalsAny(e.getErrCode(), "REFUNDNOTEXIST", "RESOURCE_NOT_EXISTS")) {
+                String errorCode = getErrorCode(e);
+                String errorMessage = getErrorMessage(e);
+                return PayRefundRespDTO.failureOf(errorCode, errorMessage,
+                        outRefundNo, e.getXmlString());
+            }
+            throw e;
+        }
+    }
+
+    private PayRefundRespDTO doGetRefundV2(String outTradeNo, String outRefundNo) throws WxPayException {
+        // 1. 构建 WxPayRefundRequest 请求
+        WxPayRefundQueryRequest request = WxPayRefundQueryRequest.newBuilder()
+                .outTradeNo(outTradeNo)
+                .outRefundNo(outRefundNo)
+                .build();
+        // 2.1 执行请求
+        WxPayRefundQueryResult response = client.refundQuery(request);
+        // 2.2 创建返回结果
+        if (!Objects.equals("SUCCESS", response.getResultCode())) {
+            return PayRefundRespDTO.waitingOf(null,
+                    outRefundNo, response);
+        }
+        WxPayRefundQueryResult.RefundRecord refund = CollUtil.findOne(response.getRefundRecords(),
+                record -> record.getOutRefundNo().equals(outRefundNo));
+        if (refund == null) {
+            return PayRefundRespDTO.failureOf(outRefundNo, response);
+        }
+        switch (refund.getRefundStatus()) {
+            case "SUCCESS":
+                return PayRefundRespDTO.successOf(refund.getRefundId(), parseDateV2B(refund.getRefundSuccessTime()),
+                        outRefundNo, response);
+            case "PROCESSING":
+                return PayRefundRespDTO.waitingOf(refund.getRefundId(),
+                        outRefundNo, response);
+            case "CHANGE": // 退款到银行发现用户的卡作废或者冻结了，导致原路退款银行卡失败，资金回流到商户的现金帐号，需要商户人工干预，通过线下或者财付通转账的方式进行退款
+            case "FAIL":
+                return PayRefundRespDTO.failureOf(outRefundNo, response);
+            default:
+                throw new IllegalArgumentException(String.format("未知的退款状态(%s)", refund.getRefundStatus()));
+        }
+    }
+
+    private PayRefundRespDTO doGetRefundV3(String outTradeNo, String outRefundNo) throws WxPayException {
+        // 1. 构建 WxPayRefundRequest 请求
+        WxPayRefundQueryV3Request request = new WxPayRefundQueryV3Request();
+        request.setOutRefundNo(outRefundNo);
+        // 2.1 执行请求
+        WxPayRefundQueryV3Result response = client.refundQueryV3(request);
+        // 2.2 创建返回结果
+        switch (response.getStatus()) {
+            case "SUCCESS":
+                return PayRefundRespDTO.successOf(response.getRefundId(), parseDateV3(response.getSuccessTime()),
+                        outRefundNo, response);
+            case "PROCESSING":
+                return PayRefundRespDTO.waitingOf(response.getRefundId(),
+                        outRefundNo, response);
+            case "ABNORMAL": // 退款异常
+            case "CLOSED":
+                return PayRefundRespDTO.failureOf(outRefundNo, response);
+            default:
+                throw new IllegalArgumentException(String.format("未知的退款状态(%s)", response.getStatus()));
+        }
     }
 
     // ========== 各种工具方法 ==========

yudao-module-pay/yudao-module-pay-biz/src/main/java/cn/iocoder/yudao/module/pay/service/refund/PayRefundServiceImpl.java

@@ -114,7 +114,7 @@ public class PayRefundServiceImpl implements PayRefundService {
         // 2.1 插入退款单
         String no = noRedisDAO.generate(payProperties.getRefundNoPrefix());
         refund = PayRefundConvert.INSTANCE.convert(reqDTO)
-                .setNo(no).setOrderId(order.getId())
+                .setNo(no).setOrderId(order.getId()).setOrderNo(order.getNo())
                 .setChannelId(order.getChannelId()).setChannelCode(order.getChannelCode())
                 // 商户相关的字段
                 .setNotifyUrl(app.getRefundNotifyUrl())