【修复】修复微信服务商开通子商户号支付异常的问题。

CoreCms.Net.Services/Pay/WeChatPayServices.cs

@@ -174,7 +174,14 @@ namespace CoreCms.Net.Services
 
                 if (tradeType == GlobalEnumVars.WeiChatPayTradeType.JSAPI.ToString())
                 {
-                    orderRequest.OpenId = openId;
+                    if (!string.IsNullOrEmpty(_optionsAccessor.Value.SubMchId))
+                    {
+                        orderRequest.SubOpenId = openId;
+                    }
+                    else
+                    {
+                        orderRequest.OpenId = openId;
+                    }
                 }
 
                 var response = await _client.ExecuteAsync(orderRequest, _optionsAccessor.Value);