微信支付之退款

微信支付   
  1. <?php
  2. /**
  3.  * 关于微信退款的说明
  4.  * 1.微信退款要求必传证书，需要到https://pay.weixin.qq.com 账户中心->账户设置->API安全->下载证书，证书路径在第119行和122行修改
  5.  * 2.错误码参照 ：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4
  6.  */
  7. header('Content-type:text/html; Charset=utf-8');
  8. $mchid = 'xxxxx';          //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
  9. $appid = 'xxxxx';  //微信支付申请对应的公众号的APPID
  10. $apiKey = 'xxxxx';   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
  11. $orderNo = '';                      //商户订单号（商户订单号与微信订单号二选一，至少填一个）
  12. $wxOrderNo = '';                     //微信订单号（商户订单号与微信订单号二选一，至少填一个）
  13. $totalFee = 0.01;                   //订单金额，单位:元
  14. $refundFee = 0.01;                  //退款金额，单位:元
  15. $refundNo = 'refund_'.uniqid();        //退款订单号(可随机生成)
  16. $wxPay = new WxpayService($mchid,$appid,$apiKey);
  17. $result = $wxPay->doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo,$orderNo);
  18. if($result===true){
  19.     echo 'refund success';exit();
  20. }
  21. echo 'refund fail';
  23. class WxpayService
  24. {
  25.     protected $mchid;
  26.     protected $appid;
  27.     protected $apiKey;
  28.     public $data = null;
  30.     public function __construct($mchid, $appid, $key)
  31.     {
  32.         $this->mchid = $mchid; //https://pay.weixin.qq.com 产品中心-开发配置-商户号
  33.         $this->appid = $appid; //微信支付申请对应的公众号的APPID
  34.         $this->apiKey = $key;   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
  35.     }
  37.     /**
  38.      * 退款
  39.      * @param float $totalFee 订单金额 单位元
  40.      * @param float $refundFee 退款金额 单位元
  41.      * @param string $refundNo 退款单号
  42.      * @param string $wxOrderNo 微信订单号
  43.      * @param string $orderNo 商户订单号
  44.      * @return string
  45.      */
  46.     public function doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo='',$orderNo='')
  47.     {
  48.         $config = array(
  49.             'mch_id' => $this->mchid,
  50.             'appid' => $this->appid,
  51.             'key' => $this->apiKey,
  52.         );
  53.         $unified = array(
  54.             'appid' => $config['appid'],
  55.             'mch_id' => $config['mch_id'],
  56.             'nonce_str' => self::createNonceStr(),
  57.             'total_fee' => intval($totalFee * 100),       //订单金额     单位 转为分
  58.             'refund_fee' => intval($refundFee * 100),       //退款金额 单位 转为分
  59.             'sign_type' => 'MD5',           //签名类型 支持HMAC-SHA256和MD5，默认为MD5
  60.             'transaction_id'=>$wxOrderNo,               //微信订单号
  61.             'out_trade_no'=>$orderNo,        //商户订单号
  62.             'out_refund_no'=>$refundNo,        //商户退款单号
  63.             'refund_desc'=>'商品已售完',     //退款原因（选填）
  64.         );
  65.         $unified['sign'] = self::getSign($unified, $config['key']);
  66.         $responseXml = $this->curlPost('https://api.mch.weixin.qq.com/secapi/pay/refund', self::arrayToXml($unified));
  67.         $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
  68.         if ($unifiedOrder === false) {
  69.             die('parse xml error');
  70.         }
  71.         if ($unifiedOrder->return_code != 'SUCCESS') {
  72.             die($unifiedOrder->return_msg);
  73.         }
  74.         if ($unifiedOrder->result_code != 'SUCCESS') {
  75.             die($unifiedOrder->err_code);
  76.         }
  77.         return true;
  78.     }
  80.     public static function curlGet($url = '', $options = array())
  81.     {
  82.         $ch = curl_init($url);
  83.         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  84.         curl_setopt($ch, CURLOPT_TIMEOUT, 30);
  85.         if (!empty($options)) {
  86.             curl_setopt_array($ch, $options);
  87.         }
  88.         //https请求 不验证证书和host
  89.         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  90.         curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
  91.         $data = curl_exec($ch);
  92.         curl_close($ch);
  93.         return $data;
  94.     }
  96.     public function curlPost($url = '', $postData = '', $options = array())
  97.     {
  98.         if (is_array($postData)) {
  99.             $postData = http_build_query($postData);
  100.         }
  101.         $ch = curl_init();
  102.         curl_setopt($ch, CURLOPT_URL, $url);
  103.         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  104.         curl_setopt($ch, CURLOPT_POST, 1);
  105.         curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
  106.         curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
  107.         if (!empty($options)) {
  108.             curl_setopt_array($ch, $options);
  109.         }
  110.         //https请求 不验证证书和host
  111.         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  112.         curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
  114.         //第一种方法，cert 与 key 分别属于两个.pem文件
  115.         //默认格式为PEM，可以注释
  116.         curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
  117.         curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/cert/apiclient_cert.pem');
  118.         //默认格式为PEM，可以注释
  119.         curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
  120.         curl_setopt($ch,CURLOPT_SSLKEY,getcwd().'/cert/apiclient_key.pem');
  121.         //第二种方式，两个文件合成一个.pem文件
  122. //        curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/all.pem');
  123.         $data = curl_exec($ch);
  124.         curl_close($ch);
  125.         return $data;
  126.     }
  128.     public static function createNonceStr($length = 16)
  129.     {
  130.         $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  131.         $str = '';
  132.         for ($i = 0; $i < $length; $i++) {
  133.             $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
  134.         }
  135.         return $str;
  136.     }
  137.     public static function arrayToXml($arr)
  138.     {
  139.         $xml = "<xml>";
  140.         foreach ($arr as $key => $val) {
  141.             if (is_numeric($val)) {
  142.                 $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
  143.             } else
  144.                 $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
  145.         }
  146.         $xml .= "</xml>";
  147.         return $xml;
  148.     }
  150.     public static function getSign($params, $key)
  151.     {
  152.         ksort($params, SORT_STRING);
  153.         $unSignParaString = self::formatQueryParaMap($params, false);
  154.         $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
  155.         return $signStr;
  156.     }
  157.     protected static function formatQueryParaMap($paraMap, $urlEncode = false)
  158.     {
  159.         $buff = "";
  160.         ksort($paraMap);
  161.         foreach ($paraMap as $k => $v) {
  162.             if (null != $v && "null" != $v) {
  163.                 if ($urlEncode) {
  164.                     $v = urlencode($v);
  165.                 }
  166.                 $buff .= $k . "=" . $v . "&";
  167.             }
  168.         }
  169.         $reqPar = '';
  170.         if (strlen($buff) > 0) {
  171.             $reqPar = substr($buff, 0, strlen($buff) - 1);
  172.         }
  173.         return $reqPar;
  174.     }
  175. }
  176. ?>


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