$refund_fee = "1"; } else { $out_trade_no = $_POST["out_trade_no"]; $refund_fee = $_POST["refund_fee"]; //商户退款单号,商户自定义,此处仅作举例 $out_refund_no = "{$out_trade_no}" . "{$time_stamp}"; //总金额需与订单号out_trade_no对应,demo中的所有订单的总金额为1分 $total_fee = "1"; //使用退款接口 $refund = new Refund(); //设置必填参数 //appid已填,商户无需重复填写 //mch_id已填,商户无需重复填写 //noncestr已填,商户无需重复填写 //sign已填,商户无需重复填写 $refund->setParameter("out_trade_no", "{$out_trade_no}"); //商户订单号 $refund->setParameter("out_refund_no", "{$out_refund_no}"); //商户退款单号 $refund->setParameter("total_fee", "{$total_fee}"); //总金额 $refund->setParameter("refund_fee", "{$refund_fee}"); //退款金额 $refund->setParameter("op_user_id", WxPayConf::MCHID); //操作员 //非必填参数,商户可根据实际情况选填 //$refund->setParameter("sub_mch_id","XXXX");//子商户号 //$refund->setParameter("device_info","XXXX");//设备号 //$refund->setParameter("transaction_id","XXXX");//微信订单号 //调用结果 $refundResult = $refund->getResult();