PHP implements WeChat payment for corporate payments

This article mainly introduces the enterprise payment function of PHP to implement WeChat payment in detail. It has 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 transfer money to the designated WeChat user.

Things to note:

1. WeChat enterprise payment requires a certificate to be transferred to the change. 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
/**
 * 关于微信企业付款的说明
 * 1.微信企业付款要求必传证书，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207行和210行修改
 * 2.错误码参照 ：https://pay.weixin.qq.com/wiki/doc/api/tools/mch_pay.php?chapter=14_2
 */
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
$appKey = &#39;xxxxx&#39;; //微信支付申请对应的公众号的APP Key
$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

//①、获取当前访问页面的用户openid（如果给指定用户转账，则直接填写指定用户的openid)
$wxPay = new WxpayService($mchid,$appid,$appKey,$apiKey);
$openId = $wxPay->GetOpenid(); //获取openid
if(!$openId) exit(&#39;获取openid失败&#39;);
//②、付款
$outTradeNo = uniqid(); //订单号
$payAmount = 1;  //转账金额，单位:元。转账最小金额为1元
$trueName = &#39;张三&#39;;  //收款人真实姓名
$result = $wxPay->createJsBizPackage($openId,$payAmount,$outTradeNo,$trueName);
echo &#39;success&#39;;
class WxpayService
{
 protected $mchid;
 protected $appid;
 protected $appKey;
 protected $apiKey;
 public $data = null;

 public function __construct($mchid, $appid, $appKey,$key)
 {
 $this->mchid = $mchid;
 $this->appid = $appid;
 $this->appKey = $appKey;
 $this->apiKey = $key;
 }

 /**
 * 通过跳转获取用户的openid，跳转流程如下：
 * 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
 * 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
 * @return 用户的openid
 */
 public function GetOpenid()
 {
 //通过code获得openid
 if (!isset($_GET[&#39;code&#39;])){
  //触发微信返回code码
  $scheme = $_SERVER[&#39;HTTPS&#39;]==&#39;on&#39; ? &#39;https://&#39; : &#39;http://&#39;;
  $baseUrl = urlencode($scheme.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;PHP_SELF&#39;].$_SERVER[&#39;QUERY_STRING&#39;]);
  $url = $this->__CreateOauthUrlForCode($baseUrl);
  Header("Location: $url");
  exit();
 } else {
  //获取code码，以获取openid
  $code = $_GET[&#39;code&#39;];
  $openid = $this->getOpenidFromMp($code);
  return $openid;
 }
 }

 /**
 * 通过code从工作平台获取openid机器access_token
 * @param string $code 微信跳转回来带上的code
 * @return openid
 */
 public function GetOpenidFromMp($code)
 {
 $url = $this->__CreateOauthUrlForOpenid($code);
 $res = self::curlGet($url);
 //取出openid
 $data = json_decode($res,true);
 $this->data = $data;
 $openid = $data[&#39;openid&#39;];
 return $openid;
 }

 /**
 * 构造获取open和access_toke的url地址
 * @param string $code，微信跳转带回的code
 * @return 请求的url
 */
 private function __CreateOauthUrlForOpenid($code)
 {
 $urlObj["appid"] = $this->appid;
 $urlObj["secret"] = $this->appKey;
 $urlObj["code"] = $code;
 $urlObj["grant_type"] = "authorization_code";
 $bizString = $this->ToUrlParams($urlObj);
 return "https://api.weixin.qq.com/sns/oauth2/access_token?".$bizString;
 }

 /**
 * 构造获取code的url连接
 * @param string $redirectUrl 微信服务器回跳的url，需要url编码
 * @return 返回构造好的url
 */
 private function __CreateOauthUrlForCode($redirectUrl)
 {
 $urlObj["appid"] = $this->appid;
 $urlObj["redirect_uri"] = "$redirectUrl";
 $urlObj["response_type"] = "code";
 $urlObj["scope"] = "snsapi_base";
 $urlObj["state"] = "STATE"."#wechat_redirect";
 $bizString = $this->ToUrlParams($urlObj);
 return "https://open.weixin.qq.com/connect/oauth2/authorize?".$bizString;
 }

 /**
 * 拼接签名字符串
 * @param array $urlObj
 * @return 返回已经拼接好的字符串
 */
 private function ToUrlParams($urlObj)
 {
 $buff = "";
 foreach ($urlObj as $k => $v)
 {
  if($k != "sign") $buff .= $k . "=" . $v . "&";
 }
 $buff = trim($buff, "&");
 return $buff;
 }

 /**
 * 企业付款
 * @param string $openid 调用【网页授权获取用户信息】接口获取到用户在该公众号下的Openid
 * @param float $totalFee 收款总费用 单位元
 * @param string $outTradeNo 唯一的订单号
 * @param string $orderName 订单名称
 * @param string $notifyUrl 支付结果通知url 不要有问号
 * @param string $timestamp 支付时间
 * @return string
 */
 public function createJsBizPackage($openid, $totalFee, $outTradeNo,$trueName)
 {
 $config = array(
  &#39;mch_id&#39; => $this->mchid,
  &#39;appid&#39; => $this->appid,
  &#39;key&#39; => $this->apiKey,
 );
 $unified = array(
  &#39;mch_appid&#39; => $config[&#39;appid&#39;],
  &#39;mchid&#39; => $config[&#39;mch_id&#39;],
  &#39;nonce_str&#39; => self::createNonceStr(),
  &#39;openid&#39; => $openid,
  &#39;check_name&#39;=>&#39;FORCE_CHECK&#39;, //校验用户姓名选项。NO_CHECK：不校验真实姓名，FORCE_CHECK：强校验真实姓名
  &#39;re_user_name&#39;=>$trueName,   //收款用户真实姓名（不支持给非实名用户打款）
  &#39;partner_trade_no&#39; => $outTradeNo,
  &#39;spbill_create_ip&#39; => &#39;127.0.0.1&#39;,
  &#39;amount&#39; => intval($totalFee * 100), //单位 转为分
  &#39;desc&#39;=>&#39;付款&#39;,  //企业付款操作说明信息
 );
 $unified[&#39;sign&#39;] = self::getSign($unified, $config[&#39;key&#39;]);
 $responseXml = $this->curlPost(&#39;https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers&#39;, self::arrayToXml($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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