fix: 根据 PR Review 意见完善服务商退款字段补齐逻辑

Co-authored-by: binarywang <1343140+binarywang@users.noreply.github.com>

Author: Copilot

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayPartnerRefundV3Request.java

@@ -11,7 +11,6 @@
  * 微信支付服务商退款请求
  * 文档见：https://pay.weixin.qq.com/wiki/doc/apiv3_partner/apis/chapter4_1_9.shtml
  *
- * @author GitHub Copilot
  */
 @Data
 @NoArgsConstructor

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java

@@ -404,6 +404,12 @@ public WxPayRefundV3Result refundV3(WxPayRefundV3Request request) throws WxPayEx
 
   @Override
   public WxPayRefundV3Result partnerRefundV3(WxPayPartnerRefundV3Request request) throws WxPayException {
+    if (StringUtils.isBlank(request.getSpAppid())) {
+      request.setSpAppid(this.getConfig().getAppId());
+    }
+    if (StringUtils.isBlank(request.getSubAppid()) && StringUtils.isNotBlank(this.getConfig().getSubAppId())) {
+      request.setSubAppid(this.getConfig().getSubAppId());
+    }
     if (StringUtils.isBlank(request.getNotifyUrl())) {
       request.setNotifyUrl(this.getConfig().getRefundNotifyUrl());
     }

weixin-java-pay/src/test/java/com/github/binarywang/wxpay/bean/request/WxPayPartnerRefundV3RequestTest.java

@@ -9,7 +9,6 @@
 /**
  * {@link WxPayPartnerRefundV3Request} 单元测试
  *
- * @author GitHub Copilot
  */
 public class WxPayPartnerRefundV3RequestTest {
 
@@ -26,10 +25,15 @@ public void testSpAppidAndSubAppidSerialization() {
     String json = gson.toJson(request);
     JsonObject jsonObject = gson.fromJson(json, JsonObject.class);
 
+    assertThat(jsonObject.has("sp_appid")).isTrue();
     assertThat(jsonObject.get("sp_appid").getAsString()).isEqualTo("wx8888888888888888");
+    assertThat(jsonObject.has("sub_appid")).isTrue();
     assertThat(jsonObject.get("sub_appid").getAsString()).isEqualTo("wxd678efh567hg6999");
+    assertThat(jsonObject.has("sub_mchid")).isTrue();
     assertThat(jsonObject.get("sub_mchid").getAsString()).isEqualTo("1230000109");
+    assertThat(jsonObject.has("out_refund_no")).isTrue();
     assertThat(jsonObject.get("out_refund_no").getAsString()).isEqualTo("1217752501201407033233368018");
+    assertThat(jsonObject.has("funds_account")).isTrue();
     assertThat(jsonObject.get("funds_account").getAsString()).isEqualTo("AVAILABLE");
   }
 
@@ -44,6 +48,7 @@ public void testSubAppidIsOptional() {
     String json = gson.toJson(request);
     JsonObject jsonObject = gson.fromJson(json, JsonObject.class);
 
+    assertThat(jsonObject.has("sp_appid")).isTrue();
     assertThat(jsonObject.get("sp_appid").getAsString()).isEqualTo("wx8888888888888888");
     assertThat(jsonObject.has("sub_appid")).isFalse();
   }