thinkphp6（php）框架实现微信小程序退款（微信支付v2）

微信支付v2

目录

微信支付v2

1.微信支付V2封装

2.业务层代码

---

1.微信支付V2封装

<?php

namespace app\common\service\wechat;

use AllowDynamicProperties;
use think\facade\Request;

/**
 * 微信v2
 */
#[AllowDynamicProperties] class PayV2Service{
    private array $values = [];

    public function __construct($param = null){
        if(is_array($param)){
            foreach($param as $k => $v){
                $this -> set_param($k, $v);
            }
        }
    }

    /**
     * 获得jsapi参数
     */
    public function get_jsApi_parameters(){
        $time = time();
        $data = array(
            'appId' => $this -> values['appid'],
            'timeStamp' => "$time", // 时间戳为整数类型的在ios会出错
            'nonceStr' => $this -> make_nocestr(),
            'package' => 'prepay_id='.$this -> prepay_id,
            'signType' => 'MD5'
        );
        $data['paySign'] = $this -> make_sign($data);
        return json_encode($data);
    }

    /**
     * 统一下单接口
     */
    public function unifiedOrder(){
        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        $param = array(
            'appid' 			=> $this -> values['appid'],
            'mch_id' 			=> $this -> values['mch_id'],
            'nonce_str' 		=> $this -> make_nocestr(),
            'body' 				=> $this -> values['body'],
            'out_trade_no' 		=> $this -> values['out_trade_no'],
            'total_fee' 		=> $this -> values['total_fee'],
            'spbill_create_ip'	=> $_SERVER['REMOTE_ADDR'],
            'notify_url' 		=> $this -> values['notify_url'],
            'trade_type' 		=> 'JSAPI',
            'openid' 			=> $this -> values['openid']
        );

        // 可选参数,请求参数含义请参考https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1
        $option = array(
            'device_info',
            'detail',
            'attach',
            'fee_type',
            'time_start',
            'time_expire',
            'goods_tag',
            'product_id',
            'limit_pay',
        );
        foreach($option as $v){
            if(!empty($this -> values[$v]))
                $param[$v] = $this -> values[$v];
        }
        $param['sign'] = $this -> make_sign($param);
        $xml = $this -> arr2xml($param);
        $rt = $this -> http_post($url, $xml);
        $rt_arr = $this -> xml2arr($rt);
        if($rt_arr['result_code'] == 'SUCCESS' && $rt_arr['return_code'] == 'SUCCESS'){
            $this -> prepay_id = $rt_arr['prepay_id'];
            return $rt_arr['prepay_id'];
        }else {
            $this -> uoerror = "统一下单接口调用失败";
            return false;
        }
    }

    // 申请退款
    public function refund()
    {
        $url = "https://api.mch.weixin.qq.com/secapi/pay/refund";
        $param = array(
            'appid' 			=> $this->values['appid'],
            'mch_id' 			=> $this->values['mch_id'],
            'nonce_str' 		=> $this->make_nocestr(),
//            'transaction_id' 	=> $this->values['third_order_id'],
            'out_trade_no' 		=> $this->values['out_trade_no'],
            'out_refund_no' 	=> $this->values['out_refund_no'],
            'total_fee' 		=> $this->values['total_fee'],
            'refund_fee' 		=> $this->values['refund_fee'],
            'notify_url' 		=> Request::domain().'/api/pay/notifyWxMiniRefund',
        );

        $param['sign'] = $this->make_sign($param);
        $xml = $this->arr2xml($param);
        $rt = $this->http_post($url, $xml);
        $rt_arr = $this->xml2arr($rt);
        if (isset($rt_arr['result_code']) && $rt_arr['result_code'] == 'SUCCESS' && $rt_arr['return_code'] == 'SUCCESS') {
            $res['code'] = 1;
            $res['msg'] = '退款成功';
            $res['data'] = $rt_arr;
        } else {
            $res['code'] = 0;
            $res['msg'] = $rt_arr['return_msg'];
            $res['data'] = $rt_arr;
        }
        return $res;
    }

    /**
     *	获取通知数据
     */
    public function get_notify_data(){
        $xml = file_get_contents("php://input");
        $this -> notify_data = $this -> xml2arr($xml);
        return $this -> notify_data;
    }

    /**
     * 解密微信支付回调数据
     * @param string $reqInfo 加密数据
     * @return array|false
     */
    public function decryptData($reqInfo) {
        $key = md5($this->values['key']); // 商户key key设置路径：微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置
        $reqData = openssl_decrypt($reqInfo, 'AES-256-ECB', $key);
        if (!$reqData) return false;
        return $this->xml2arr($reqData);
    }

    /**
     * 验证通知的签名
     */
    public function check_sign(){
        $data = $this -> notify_data;
        unset($data['sign']); // 签名值不参与签名
        $sign = $this -> make_sign($data);
        if($sign == $this -> notify_data['sign'])
            return true;
        else return false;
    }

    /**
     *	设置参数
     *	@param string $name 参数名
     *	@param mixed $value 值
     */
    public function set_param($name, $value = null){
        if (is_array($name)){
            foreach($name as $key => $val){
                $this->set_param($key, $val);
            }
        } else {
            $this->values[$name] = $value;
        }
    }


    /**
     * 生成随机字符串
     */
    public function make_nocestr($length = 32)
    {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ )  {
            $str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }

    /**
     *	将数组转换为xml
     *	@param array $data	要转换的数组
     *	@param bool $root 	是否要根节点
     *	@return string 		xml字符串
     *	@link http://www.cnblogs.com/dragondean/p/php-array2xml.html
     */
    private function arr2xml($data, $root = true): string
    {
        $str="";
        if($root)$str .= "<xml>";
        foreach($data as $key => $val){
            //去掉key中的下标[]
            $key = preg_replace('/\[\d*\]/', '', $key);
            if(is_array($val)){
                $child = $this->arr2xml($val, false);
                $str .= "<$key>$child</$key>";
            }else{
                $str.= "<$key><![CDATA[$val]]></$key>";
            }
        }
        if($root)$str .= "</xml>";
        return $str;
    }

    /**
     *	xml转为数组
     *	@param string $xml 原始的xml字符串
     */
    public function xml2arr($xml){
        $xml = new \SimpleXMLElement($xml);
        if(!is_object($xml)){
            $this->errmsg = "xml数据接收错误";
            return false;
        }
        $arr = array();
        foreach ($xml as $key => $value) {
            $arr[strtolower($key)] = strval($value);
        }
        return $arr;
    }

    /**
     * 生成签名
     * @return string 签名，本函数不覆盖sign成员变量，如要设置签名需要调用SetSign方法赋值
     */
    public function make_sign($values, $key = null): string
    {
        if(empty($key))
            $key = $this -> values['key'];
        //签名步骤一：按字典序排序参数
        ksort($values);
        //$string = $this->ToUrlParams();
        $string =  urldecode(http_build_query($values));
        //签名步骤二：在string后加入KEY
        $string = $string . "&key=".$key;
        //签名步骤三：MD5加密
        $string = md5($string);
        //签名步骤四：所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }

    /**
     *	GET方式抓取数据
     *	@param string $url 要抓取的URL
     */
    private function http_get($url, $data = null){
        $this->url = $url;
        $data && $this->data = $data;
        $this->method = "GET";
        return $this->excrequest();
    }

    /**
     *	POST提交数据并返回内容
     *	@param string $url 要请求的地址
     *	@param mixed $data 提交的数据
     */
    private function http_post($url, $data = null){
        $this->url = $url;
        $this->method = "POST";
        $this->data = $data;
        return $this->excrequest();
    }

    /**
     * 获取证书
     *
     * @return string 证书路径
     */
    public function getSslCertificate()
    {
        return realpath(app()->getRootPath().'public/cert/wechatv2/'.$this->values['appid'].'/apiclient_cert.pem');
    }

    /**
     * 获取秘钥
     *
     * @return string 证书路径
     */
    public function getSslKey()
    {
        return realpath(app()->getRootPath().'public/cert/wechatv2/'.$this->values['appid'].'/apiclient_key.pem');
    }

    /**
     *	执行请求并返回数据
     *	@access private
     */
    private function excrequest(){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $this->url);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $this->method );
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

        if($this->sslcert){
            curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
            curl_setopt($ch, CURLOPT_SSLCERT, $this->getSslCertificate());
        }
        if($this->sslkey){
            curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
            curl_setopt($ch, CURLOPT_SSLKEY, $this->getSslKey());
        }
        //echo $this->data;
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $this->data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $tmpInfo = curl_exec($ch);
        $errorno = curl_errno($ch);
        if(!$errorno)return $tmpInfo;
        else{
            $this->errmsg = $errorno;
            return false;
        }
    }
}

2.业务层代码

    protected static function wxMiniRefund($orderInfo,$outsn):void
    {
        $miniProgram = Db::table("ap_mini_program")->where(['code'=>$orderInfo['source'],'type'=>MiniProgramTypeEnum::WECHAT])->find();
        if(!$miniProgram){
            throw new \Exception("微信小程序：{$orderInfo['source']}未配置");
        }

        //微信支付jsapi
        $jsapi = new PayV2Service;
        $param['appid'] = $miniProgram['app_id'];
        $param['mch_id'] = $miniProgram['mch_id'];
        $param['key'] = $miniProgram['mch_key'];
        $param['transaction_id'] = $orderInfo['third_order_id'];
        $param['out_trade_no'] = $orderInfo['sn'];
        $param['out_refund_no'] = $outsn;
        $param['refund_fee'] = $param['total_fee'] = $orderInfo['money'] * 100;
        $jsapi->set_param($param);
        $jsapi->sslcert = true;
        $jsapi->sslkey = true;
        $res = $jsapi->refund();
        if (!$res['code']) {
            throw new \Exception("微信小程序退款发生错误：{$res['msg']}");
        }
    }