/*** @Notes:退款* @param $out_trade_no 支付时候订单号（order表 original_bn）两个参数选一个这个要选对* @param $out_refund_no 退款订单号* @param $total 订单金额* @param $refund 退款金额* @Time: 2023-08-10*/public function refundMoney($out_trade_no , $out_refund_no , $total , $refund){$config = config('wechat.wechat');$time=time();$refundData=['out_refund_no'=>$out_refund_no,	//退款订单号自己生成就好'reason'=>'商品退款','notify_url'=>$config['pay']['refundNotifyUrl'],//退款回调地址'out_trade_no' => $out_trade_no,'amount'=>['refund'=> $refund, //退款标价金额，单位为分，可以做部分退款'total'=> $total, //订单总金额，单位为分'currency'=>'CNY']];$url='https://api.mch.weixin.qq.com/v3/refund/domestic/refunds';$urlarr = parse_url($url); //拆解为：[scheme=>https,host=>api.mch.weixin.qq.com,path=>/v3/pay/transactions/native]$mchid =$config['pay']['merchantId'];//商户ID$xlid = $config['pay']['serialNumber'];//证书序列号$refundData=json_encode($refundData);$nonce = $this->randomString();$key = $this->getSign($refundData,$urlarr['path'],$nonce,$time);$token = sprintf('mchid="%s",serial_no="%s",nonce_str="%s",timestamp="%d",signature="%s"',$mchid,$xlid,$nonce,$time,$key);$header  = array('Accept: application/json','Content-Type: application/json','User-Agent:*/*','Authorization: WECHATPAY2-SHA256-RSA2048 '.$token);$res=$this->curl_post_https($url,$refundData,$header);$res_array=json_decode($res,true);return $res_array;}

   // 生成随机字符串private function randomString($len = 32){$string = '';$char = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';for ($i = 0; $i < $len; $i++) {$string .= $char[mt_rand(0, strlen($char) - 1)];}return $string;}//微信支付签名function getSign($data=array(),$url,$randstr,$time){$str = "POST"."\n".$url."\n".$time."\n".$randstr."\n".$data."\n";$key = file_get_contents(getcwd() .'/cert/apiclient_key.pem');//在商户平台下载的秘钥,读取到变量 最好是放到public下边 $str = $this->getSha256WithRSA($str,$key);return $str;}//加密public function getSha256WithRSA($content, $privateKey){$binary_signature = "";$algo = "SHA256";openssl_sign($content, $binary_signature, $privateKey, $algo);$sign = base64_encode($binary_signature);return $sign;}//退款用function curl_post_https($url,$data,$header){ // 模拟提交数据函数$curl = curl_init(); // 启动一个CURL会话curl_setopt($curl, CURLOPT_URL, $url); // 要访问的地址curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0); // 对认证证书来源的检查curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0); // 从证书中检查SSL加密算法是否存在，如果出错则修改为0，默认为1curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']); // 模拟用户使用的浏览器curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1); // 使用自动跳转curl_setopt($curl, CURLOPT_AUTOREFERER, 1); // 自动设置Referercurl_setopt($curl, CURLOPT_POST, 1); // 发送一个常规的Post请求curl_setopt($curl, CURLOPT_POSTFIELDS, $data); // Post提交的数据包curl_setopt($curl, CURLOPT_TIMEOUT, 30); // 设置超时限制防止死循环curl_setopt($curl, CURLOPT_HEADER, 0); // 显示返回的Header区域内容curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回curl_setopt($curl, CURLOPT_HTTPHEADER, $header);$tmpInfo = curl_exec($curl); // 执行操作if (curl_errno($curl)) {echo 'Errno'.curl_error($curl);//捕抓异常}curl_close($curl); // 关闭CURL会话return $tmpInfo; // 返回数据，json格式}

调用

    $res = WxPay::instance()->refundMoney($order['original_bn'] , $order['order_bn'] , $sum , $order['total_money']);$msg = '';if (!empty($res['code'])) {$msg = $res['message'];}if (!empty($res['status'])) {if ($res['status'] == 'SUCCESS'){$msg = '退款成功';} else if ($res['status'] == 'CLOSED') {$msg = '退款关闭';} else if ($res['status'] == 'PROCESSING') {$msg = '退款处理中';} else if ($res['status'] == 'ABNORMAL') {$msg = '退款异常';}}return $msg;