以下是两次退款申请返回的数据，同一个订单编号，退款编号，两次都是全额退款，返回的结果是退款成功，但是微信上并没有收到退款，麻烦看一下，正常情况下是不是应该返回该笔订单已全额退款之类的信息吧，总感觉怪怪的  ，能帮忙查一下吗  谢谢 2019/02/13 13:45:49 {Return_code:SUCCESS Return_msg:OK Result_code:SUCCESS Err_code: Err_code_des: Appid:wxab3a*** Mch_id:14817***** Sub_appid: Sub_mch_id:148225**** Nonce_str:aPJHlD7g3RB6P7VD Sign:A0450D019D072CCFE6F435197905DA75 Transaction_id:4200000273201901221306985525 Out_trade_no:15481455305983480 Out_refund_no:432736521b5e48cbb47bd8aa72281f14 Refund_id:50000509522019012208093667719 Refund_fee:1 Settlement_refund_fee:0 Total_fee:1 Settlement_total_fee:0 Fee_type: Cash_fee:1 Cash_refund_fee:1 Coupon_refund_fee:0 Coupon_refund_count:0} 2019/02/13 13:53:56 {Return_code:SUCCESS Return_msg:OK Result_code:SUCCESS Err_code: Err_code_des: Appid:wxab3a*** Mch_id:14817***** Sub_appid: Sub_mch_id:148225**** Nonce_str:VzgGyyCOvPOjd8kt Sign:0E38832A781AADBDF1488F325F914A46 Transaction_id:4200000273201901221306985525 Out_trade_no:15481455305983480 Out_refund_no:432736521b5e48cbb47bd8aa72281f14 Refund_id:50000509522019012208093667719 Refund_fee:1 Settlement_refund_fee:0 Total_fee:1 Settlement_total_fee:0 Fee_type: Cash_fee:1 Cash_refund_fee:1 Coupon_refund_fee:0 Coupon_refund_count:0}

[图片] 这里的仅针对老资金流商户使用怎么理解，新资金流商户的退款资金来源又是什么呢?

调用接口https://api.mch.weixin.qq.com/pay/unifiedorder 请求参数为： <PayRefund> <appid>wxab3a2c0dd****</appid> <mch_id>1481****</mch_id> <sub_mch_id>1482****</sub_mch_id> <nonce_str>15470179386****</nonce_str> <sign>1C5BBC788F79EB76BB38F90****</sign> <transaction_id>4200000222201811194666971278</transaction_id> <out_trade_no>806915d32dd045b691****</out_trade_no> <out_refund_no>5337ec161a16456e8c5*****</out_refund_no> <total_fee>3</total_fee> <refund_fee>3</refund_fee> <refund_desc>*****</refund_desc> <notify_url>http:****</notify_url> </PayRefund> 接口返回值为： {Return_code:FAIL Return_msg:缺少参数 Result_code: Err_code: Err_code_des: Appid: Mch_id: Sub_appid: Sub_mch_id: Nonce_str: Sign: Transaction_id: Out_trade_no: Out_refund_no: Refund_id: Refund_fee: Settlement_refund_fee: Total_fee: Settlement_total_fee: Fee_type: Cash_fee: Cash_refund_fee: Coupon_refund_fee: Coupon_refund_count:} 对比了一下参数没少呀，还有一个问题麻烦解答一下：api证书安装完成后，在调用微信退款接口时的用法是什么，是需要在参数里把证书文件传过去吗?不太懂