PHP實現微信退款的分析與原始碼實現
* 1.微信退款到零錢要求必傳證書，需要到https://pay.weixin.qq.com 賬戶中心->賬戶設定->API安全->下載證書，然後修改程式碼中的證書路徑
* 2.該檔案需放到支付授權目錄下，可以在微信支付商戶平臺->產品中心->開發配置中設定。
* 3.如提示簽名錯誤可以通過微信支付簽名驗證工具進行驗證：https://pay.weixin.qq.com/wiki/tools/signverify/
* 4.錯誤碼參照 ：https://pay.weixin.qq.com/wiki/doc/api/tools/mch_pay.php?chapter=14_2
程式碼如下：
<?php
/**
* 關於微信退款的說明
* 1.微信退款要求必傳證書，需要到https://pay.weixin.qq.com 賬戶中心->賬戶設定->API安全->下載證書，證書路徑在第119行和122行修改
* 2.錯誤碼參照 ：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4
*/
header('Content-type:text/html; Charset=utf-8');
$mchid = 'xxxxx'; //微信支付商戶號 PartnerID 通過微信支付商戶資料稽核後郵件傳送
$appid = 'xxxxx'; //微信支付申請對應的公眾號的APPID
$apiKey = 'xxxxx'; //https://pay.weixin.qq.com 帳戶設定-安全設定-API安全-API金鑰-設定API金鑰
$orderNo = ''; //商戶訂單號（商戶訂單號與微信訂單號二選一，至少填一個）
$wxOrderNo = ''; //微信訂單號（商戶訂單號與微信訂單號二選一，至少填一個）
$totalFee = 0.01; //訂單金額，單位:元
$refundFee = 0.01; //退款金額，單位:元
$refundNo = 'refund_'.uniqid(); //退款訂單號(可隨機生成)
$wxPay = new WxpayService($mchid,$appid,$apiKey);
$result = $wxPay->doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo,$orderNo);
if($result===true){
echo 'refund success';exit();
}
echo 'refund fail';
?>
Wxpay.php
<?php
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 產品中心-開發配置-商戶號
$this->appid = $appid; //微信支付申請對應的公眾號的APPID
$this->apiKey = $key; //https://pay.weixin.qq.com 帳戶設定-安全設定-API安全-API金鑰-設定API金鑰
}
/**
* 退款
* @param float $totalFee 訂單金額 單位元
* @param float $refundFee 退款金額 單位元
* @param string $refundNo 退款單號
* @param string $wxOrderNo 微信訂單號
* @param string $orderNo 商戶訂單號
* @return string
*/
public function doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo='',$orderNo='')
{
$config = array(
'mch_id' => $this->mchid,
'appid' => $this->appid,
'key' => $this->apiKey,
);
$unified = array(
'appid' => $config['appid'],
'mch_id' => $config['mch_id'],
'nonce_str' => self::createNonceStr(),
'total_fee' => intval($totalFee * 100), //訂單金額 單位 轉為分
'refund_fee' => intval($refundFee * 100), //退款金額 單位 轉為分
'sign_type' => 'MD5', //簽名型別 支援HMAC-SHA256和MD5，預設為MD5
'transaction_id'=>$wxOrderNo, //微信訂單號
'out_trade_no'=>$orderNo, //商戶訂單號
'out_refund_no'=>$refundNo, //商戶退款單號
'refund_desc'=>'商品已售完', //退款原因（選填）
);
$unified['sign'] = self::getSign($unified, $config['key']);
$responseXml = $this->curlPost('https://api.mch.weixin.qq.com/secapi/pay/refund', self::arrayToXml($unified));
$unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
if ($unifiedOrder === false) {
die('parse xml error');
}
if ($unifiedOrder->return_code != 'SUCCESS') {
die($unifiedOrder->return_msg);
}
if ($unifiedOrder->result_code != 'SUCCESS') {
die($unifiedOrder->err_code);
}
return true;
}
public static function curlGet($url = '', $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, $options);
}
//https請求 不驗證證書和host
curl_setopt($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 = '', $postData = '', $options = array())
{
if (is_array($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); //設定cURL允許執行的最長秒數
if (!empty($options)) {
curl_setopt_array($ch, $options);
}
//https請求 不驗證證書和host
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
//第一種方法，cert 與 key 分別屬於兩個.pem檔案
//預設格式為PEM，可以註釋
curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/cert/apiclient_cert.pem');
//預設格式為PEM，可以註釋
curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
curl_setopt($ch,CURLOPT_SSLKEY,getcwd().'/cert/apiclient_key.pem');
//第二種方式，兩個檔案合成一個.pem檔案
// curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/all.pem');
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
public static function createNonceStr($length = 16)
{
$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
$str = '';
for ($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 . "&";
}
}
$reqPar = '';
if (strlen($buff) > 0) {
$reqPar = substr($buff, 0, strlen($buff) - 1);
}
return $reqPar;
}
}
?>