PHP implements the refund function of WeChat payment

This article mainly introduces the refund function of WeChat payment in PHP in detail. It has a certain reference value. Interested friends can refer to

There are many PHP WeChat payment accesses on the Internet. The tutorials are quite complicated and require a lot of configuration and introduction of files. I have sorted them out and provided a single-file version. I hope it can bring some help and reference to those who want to access WeChat Pay.

Run this file directly to refund the designated WeChat user.

Things to note:

1. WeChat refund to change requires a certificate, you need to go here Account Center->Account Settings-> ;API Security->Download the certificate, and then modify the certificate path in the code
2. The file needs to be placed in the payment authorization directory, which can be set in WeChat Payment Merchant Platform->Product Center->Development Configuration.
3. If a signature error is prompted, you can verify it through the WeChat payment signature verification tool: WeChat public platform payment interface debugging tool
4. Error code reference: Reference address

The code is as follows:

<?php
/**
 * 关于微信退款的说明
 * 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
 * 2.错误码参照 ：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4
 */
header(&#39;Content-type:text/html; Charset=utf-8&#39;);
$mchid = &#39;xxxxx&#39;;     //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
$appid = &#39;xxxxx&#39;; //微信支付申请对应的公众号的APPID
$apiKey = &#39;xxxxx&#39;;  //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
$orderNo = &#39;&#39;;           //商户订单号（商户订单号与微信订单号二选一，至少填一个）
$wxOrderNo = &#39;&#39;;           //微信订单号（商户订单号与微信订单号二选一，至少填一个）
$totalFee = 0.01;          //订单金额，单位:元
$refundFee = 0.01;         //退款金额，单位:元
$refundNo = &#39;refund_&#39;.uniqid();    //退款订单号(可随机生成)
$wxPay = new WxpayService($mchid,$appid,$apiKey);
$result = $wxPay->doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo,$orderNo);
if($result===true){
  echo &#39;refund success&#39;;exit();
}
echo &#39;refund fail&#39;;
class WxpayService
{
  protected $mchid;
  protected $appid;
  protected $apiKey;
  public $data = null;
  public function __construct($mchid, $appid, $key)
  {
    $this->mchid = $mchid; //https://pay.weixin.qq.com 产品中心-开发配置-商户号
    $this->appid = $appid; //微信支付申请对应的公众号的APPID
    $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
  }
  /**
   * 退款
   * @param float $totalFee 订单金额 单位元
   * @param float $refundFee 退款金额 单位元
   * @param string $refundNo 退款单号
   * @param string $wxOrderNo 微信订单号
   * @param string $orderNo 商户订单号
   * @return string
   */
  public function doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo=&#39;&#39;,$orderNo=&#39;&#39;)
  {
    $config = array(
      &#39;mch_id&#39; => $this->mchid,
      &#39;appid&#39; => $this->appid,
      &#39;key&#39; => $this->apiKey,
    );
    $unified = array(
      &#39;appid&#39; => $config[&#39;appid&#39;],
      &#39;mch_id&#39; => $config[&#39;mch_id&#39;],
      &#39;nonce_str&#39; => self::createNonceStr(),
      &#39;total_fee&#39; => intval($totalFee * 100),    //订单金额  单位 转为分
      &#39;refund_fee&#39; => intval($refundFee * 100),    //退款金额 单位 转为分
      &#39;sign_type&#39; => &#39;MD5&#39;,      //签名类型 支持HMAC-SHA256和MD5，默认为MD5
      &#39;transaction_id&#39;=>$wxOrderNo,        //微信订单号
      &#39;out_trade_no&#39;=>$orderNo,    //商户订单号
      &#39;out_refund_no&#39;=>$refundNo,    //商户退款单号
      &#39;refund_desc&#39;=>&#39;商品已售完&#39;,   //退款原因（选填）
    );
    $unified[&#39;sign&#39;] = self::getSign($unified, $config[&#39;key&#39;]);
    $responseXml = $this->curlPost(&#39;https://api.mch.weixin.qq.com/secapi/pay/refund&#39;, self::arrayToXml($unified));
    $unifiedOrder = simplexml_load_string($responseXml, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA);
    if ($unifiedOrder === false) {
      die(&#39;parse xml error&#39;);
    }
    if ($unifiedOrder->return_code != &#39;SUCCESS&#39;) {
      die($unifiedOrder->return_msg);
    }
    if ($unifiedOrder->result_code != &#39;SUCCESS&#39;) {
      die($unifiedOrder->err_code);
    }
    return true;
  }
  public static function curlGet($url = &#39;&#39;, $options = array())
  {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    if (!empty($options)) {
      curl_setopt_array($ch, $options);
    }
    //https请求 不验证证书和host
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }
  public function curlPost($url = &#39;&#39;, $postData = &#39;&#39;, $options = array())
  {
    if (is_array($postData)) {
      $postData = http_build_query($postData);
    }
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
    if (!empty($options)) {
      curl_setopt_array($ch, $options);
    }
    //https请求 不验证证书和host
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    //第一种方法，cert 与 key 分别属于两个.pem文件
    //默认格式为PEM，可以注释
    curl_setopt($ch,CURLOPT_SSLCERTTYPE,&#39;PEM&#39;);
    curl_setopt($ch,CURLOPT_SSLCERT,getcwd().&#39;/cert/apiclient_cert.pem&#39;);
    //默认格式为PEM，可以注释
    curl_setopt($ch,CURLOPT_SSLKEYTYPE,&#39;PEM&#39;);
    curl_setopt($ch,CURLOPT_SSLKEY,getcwd().&#39;/cert/apiclient_key.pem&#39;);
    //第二种方式，两个文件合成一个.pem文件
//    curl_setopt($ch,CURLOPT_SSLCERT,getcwd().&#39;/all.pem&#39;);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }
  public static function createNonceStr($length = 16)
  {
    $chars = &#39;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789&#39;;
    $str = &#39;&#39;;
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }
  public static function arrayToXml($arr)
  {
    $xml = "<xml>";
    foreach ($arr as $key => $val) {
      if (is_numeric($val)) {
        $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
      } else
        $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
    }
    $xml .= "</xml>";
    return $xml;
  }
  public static function getSign($params, $key)
  {
    ksort($params, SORT_STRING);
    $unSignParaString = self::formatQueryParaMap($params, false);
    $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
    return $signStr;
  }
  protected static function formatQueryParaMap($paraMap, $urlEncode = false)
  {
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v) {
      if (null != $v && "null" != $v) {
        if ($urlEncode) {
          $v = urlencode($v);
        }
        $buff .= $k . "=" . $v . "&";
      }
    }
    $reqPar = &#39;&#39;;
    if (strlen($buff) > 0) {
      $reqPar = substr($buff, 0, strlen($buff) - 1);
    }
    return $reqPar;
  }
}
?>

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