WeChat development enterprise payment PHP code implementation

The purpose of writing this article is mainly because the SDK provided by the WeChat public platform does not provide an SDK implementation of this function.

In fact, the final implementation still relies on the WeChat public platform development documentation and SDK.

Application scenarios of enterprise payment: Official account pays users who have followed it, such as processing refunds, financial settlements, etc.

Let me talk about the implementation idea first:

Automatically install it in the SDK Extend the WxMchPay component based on the class library to realize the expansion of enterprise payment functions.

Without further ado, let’s get to the code. The following is the component that inherits the SDK to implement enterprise payment:

$parameters parameter reference: Enterprise payment API document

<?php
// 引入SDK
import(&#39;Common.Util.WxPay&#39;);

/**
 * 微信企业付款操作类
 * Author  :  Max.wen
 * DateTime: <15/9/16 11:00>
 */
class WxMchPay extends Wxpay_client_pub
{
    /**
     * API 参数
     * @var array
     * &#39;mch_appid&#39;         # 公众号APPID
     * &#39;mchid&#39;             # 商户号
     * &#39;device_info&#39;       # 设备号
     * &#39;nonce_str&#39;         # 随机字符串
     * &#39;partner_trade_no&#39;  # 商户订单号
     * &#39;openid&#39;            # 收款用户openid
     * &#39;check_name&#39;        # 校验用户姓名选项 针对实名认证的用户
     * &#39;re_user_name&#39;      # 收款用户姓名
     * &#39;amount&#39;            # 付款金额
     * &#39;desc&#39;              # 企业付款描述信息
     * &#39;spbill_create_ip&#39;  # Ip地址
     * &#39;sign&#39;              # 签名
     */
    public $parameters = [];

    public function __construct()
    {
        $this->url = &#39;https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers&#39;;
        $this->curl_timeout = WxPayConf_pub::CURL_TIMEOUT;
    }

    /**
     * 生成请求xml数据
     * @return string
     */
    public function createXml()
    {
        $this->parameters[&#39;mch_appid&#39;] = WxPayConf_pub::APPID;
        $this->parameters[&#39;mchid&#39;]     = WxPayConf_pub::MCHID;
        $this->parameters[&#39;nonce_str&#39;] = $this->createNoncestr();
        $this->parameters[&#39;sign&#39;]      = $this->getSign($this->parameters);
        return $this->arrayToXml($this->parameters);
    }


    /**
     *     作用：使用证书，以post方式提交xml到对应的接口url
     */
    function postXmlSSLCurl($xml,$url,$second=30)
    {
        $ch = curl_init();
        //超时时间
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        //这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, &#39;8.8.8.8&#39;);
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
        //设置header
        curl_setopt($ch,CURLOPT_HEADER,FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,TRUE);
        //设置证书
        curl_setopt($ch,CURLOPT_CAINFO, WxPayConf_pub::SSLROOTCA_PATH);
        //使用证书：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, WxPayConf_pub::SSLCERT_PATH);
        //默认格式为PEM，可以注释
        curl_setopt($ch,CURLOPT_SSLKEYTYPE,&#39;PEM&#39;);
        curl_setopt($ch,CURLOPT_SSLKEY, WxPayConf_pub::SSLKEY_PATH);

        //post提交方式
        curl_setopt($ch,CURLOPT_POST, true);
        curl_setopt($ch,CURLOPT_POSTFIELDS,$xml);
        $data = curl_exec($ch);
        //返回结果
        if($data){
            curl_close($ch);
            return $data;
        }
        else {
            $error = curl_errno($ch);
            echo "curl出错，错误码:$error"."<br>";
            echo "<a href=&#39;http://curl.haxx.se/libcurl/c/libcurl-errors.html&#39;>错误原因查询</a></br>";
            curl_close($ch);
            return false;
        }
    }


}

Controller layer Function implementation:

<?php
/**
 * Author  :  Max.wen
 * DateTime: <15/9/20 16:47>
 */

namespace Home\Controller;


class TestController extends CommonController
{

    /**
     * 企业付款测试
     */
    public function rebate()
    {
        import(&#39;Common.Util.WxMchPay&#39;);
        $mchPay = new \WxMchPay();
        // 用户openid
        $mchPay->setParameter(&#39;openid&#39;, &#39;oy2lbszXkgvlEKThrzqEziKEBzqU&#39;);
        // 商户订单号
        $mchPay->setParameter(&#39;partner_trade_no&#39;, &#39;test-&#39;.time());
        // 校验用户姓名选项
        $mchPay->setParameter(&#39;check_name&#39;, &#39;NO_CHECK&#39;);
        // 企业付款金额  单位为分
        $mchPay->setParameter(&#39;amount&#39;, 100);
        // 企业付款描述信息
        $mchPay->setParameter(&#39;desc&#39;, &#39;开发测试&#39;);
        // 调用接口的机器IP地址  自定义
        $mchPay->setParameter(&#39;spbill_create_ip&#39;, &#39;127.0.0.1&#39;); # getClientIp()
        // 收款用户姓名
        // $mchPay->setParameter(&#39;re_user_name&#39;, &#39;Max wen&#39;);
        // 设备信息
        // $mchPay->setParameter(&#39;device_info&#39;, &#39;dev_server&#39;);

        $response = $mchPay->postXmlSSL();
        if( !empty($response) ) {
            $data = simplexml_load_string($response, null, LIBXML_NOCDATA);
            echo json_encode($data);
        }else{
            echo json_encode( array(&#39;return_code&#39; => &#39;FAIL&#39;, &#39;return_msg&#39; => &#39;transfers_接口出错&#39;, &#39;return_ext&#39; => array()) );
        }
    }
}

After completing the above two parts of code, you can basically call the enterprise payment API successfully.

Data structure example of returned result:

{
    "return_code": "SUCCESS",
    "return_msg": { },
    "mch_appid": "wx519cae424099ed6b",
    "mchid": "1228636402",
    "device_info": { },
    "nonce_str": "qjupk84q4iqxkb578hb5h2qiatgcwxwg",
    "result_code": "SUCCESS",
    "partner_trade_no": "test-1442801966",
    "payment_no": "1000018301201509210739170397",
    "payment_time": "2015-09-21 10:19:26"
}

Possible problems:

1. CA certificate error

You can see it in WxMchPay , I rewrote the postXmlSSLCurl() method of Wxpay_client_pub in the SDK

Because this method in the SDK by default does not come with a CA certificate when making a CURL POST request.

In comparison, there are many

curl_setopt($ch,CURLOPT_CAINFO, WxPayConf_pub::SSLROOTCA_PATH); Such a line of code.　

　The function is to attach the CA certificate when requesting.

2. Transfer operations to the same user are too frequent, please try again later.

This error belongs to the limitations of the WeChat server, specific restrictions There is no explanation of the frequency, but after actual testing, it is about 1 minute.

So you need to pay more attention during development.

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