微信小程序 wx.requestPayment({}) 唤起微信支付

1. 登录商户平台，将商户和小程序进行关联

在 产品中心 中的 APPID账号管理 中，添加关联的小程序 appid

2. 小程序调起支付API

小程序调起支付API：https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_7&index=5

小程序API开发文档：https://developers.weixin.qq.com/miniprogram/dev/api/api-pay.html#wxrequestpaymentobject

3. 封装类

<?php
class Wechat
{
    // 公众号的或者小程序支付参数
    private $appId     = "wx5117bexxxxxx";
    private $appSecret = "136ae3xxxxxxx";
    // 微信商户号
    private $mch_id    = "15xxxx";
    private $mch_key   = "xxxasdfghjkxxxxxx";
    // 回调地址
    public $notify_url = '';
    // 退款回掉地址
    public $refund_notify_url = '';
    private $request;
    private $nonce_str;
    public function __construct()
    {
        $this->request = request();
        $this->notify_url = 'notice.php';
        $this->refund_notify_url = 'refund.php';
        $this->nonce_str = md5(date('YmdHis') . time() . rand(1000, 9999));
    }
    //小程序登录
    /**
     * @param $code  获取微信支付的登录code
     * @return mixed
     */
    public function wxLogin($code)
    {
        $url = "https://api.weixin.qq.com/sns/jscode2session?appid=" . $this->appId . "&secret=" . $this->appSecret . "&js_code=" . $code . "&grant_type=authorization_code";
        return json_decode($this->execute($url), true);
    }
    /**
     * @param $out_trade_no  微信支付唯一订单
     * @param $openid 微信支付用户的openid
     * @param $price  订单支付的价格,(单位,元)
     * @param string $desc 订单描述
     * @return array|mixed 组装支付参数
     */
    public function getPayParameter($out_trade_no, $openid, $price, $desc = '')
    {
        header("Content-type:text/html;charset=utf-8"); //此处进行字符集初始化，
        $data = [
            'appid'            => $this->appId,
            'body'             => $desc,
            'mch_id'           => $this->mch_id,
            'nonce_str'        => $this->nonce_str,// 随机字符串
            'notify_url'       => $this->notify_url,//异步回调地址
            'openid'           => $openid,//用户登录时获取的code中含有的值
            'out_trade_no'     => $out_trade_no,//商家订单号
            'spbill_create_ip' => $this->get_real_ip(),//APP和网页支付提交用户端ip
            'total_fee'        => $price * 100,//订单总额,单位:分
            'attach'           => 'order',//确定是哪个商家进行的支付
            'trade_type'       => 'JSAPI'//交易类型
        ];
        //将数组转化为Xml
        $data['sign'] = $this->makeSign($data);
        $abc_xml = $this->arrayToXml($data);
        //统一下单接口prepay_id
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $xml = $this->execute($url, $abc_xml, 1);
        //将XMl转化为数组
        $info = $this->xml2array($xml);
        if (!isset($info['prepay_id'])) {
            return $info;
        }
        $params = array(
            'appId'     => $this->appId,
            'nonceStr'  => $data['nonce_str'],
            'package'   => 'prepay_id=' . $info['prepay_id'],
            'signType'  => 'MD5',
            'timeStamp' => '' . time(),
        );
        $_info['paySign']    = $this->makeSign($params);
        $_info['timeStamp']  = "" . $params['timeStamp'];
        $_info['nonceStr']   = $params['nonceStr'];
        $_info['package']    = $params['package'];
        $_info['signType']   = $params['signType'];
        $_info['notify_url'] = $this->notify_url;
        // 请求成功后进行返回数据信息
        if ($info['return_code'] == 'SUCCESS' || $info['result_code'] == 'SUCCESS') {
            return $_info;
        } else {
            return [];
        }
    }
    /**
     * @param $openid  支付的用户的openid
     * @return mixed
     */
    public function userInfo($openid)
    {
        $token = $this->getWxAccessToken();
        $url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=" . $token . "&openid=$openid&lang=zh_CN";
        return json_decode($this->execute($url), true);
    }
    //获取微信的token
    public function getWxAccessToken()
    {
        $key = $this->appId . 'miniProgram_access_token';
        $accessToken = <
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