支付宝支付、退款

<?php

namespace alipay;

//APP支付

use think\Loader;

class Alipay
{
    protected $gatewayUrl = "https://openapi.alipay.com/gateway.do";

    protected $appId = "";

    protected $rsaPrivateKey = "";

    public $alipayrsaPublicKey = "";

    protected $format = "json";

    protected $charset = "UTF-8";

    protected $signType = "RSA2";

    public function __construct()
    {
        Loader::import('alipay.aop.AopClient');
        Loader::import('alipay.aop.request.AlipayTradeAppPayRequest');
        Loader::import('alipay.aop.request.AlipayTradeRefundRequest');
    }

    /**
     * APP-支付
     * @param array $param
     * $param['body']           对一笔交易的具体描述信息
     * $param['subject']        商品的标题/交易标题/订单标题/订单关键字等
     * $param['total_amount']   订单总金额，单位为元，精确到小数点后两位
     * $param['out_trade_no']   商户网站唯一订单号
     * @return string
     */
    public function pay(array $param)
    {
        $aop = new \AopClient();
        $aop->gatewayUrl = $this->gatewayUrl;
        $aop->appId = $this->appId;
        $aop->rsaPrivateKey = $this->rsaPrivateKey;
        $aop->alipayrsaPublicKey = $this->alipayrsaPublicKey;
        $aop->format = $this->format;
        $aop->charset = $this->charset;
        $aop->signType = $this->signType;
        //实例化具体API对应的request类,类名称和接口名称对应,当前调用接口名称：alipay.trade.app.pay
        $request = new \AlipayTradeAppPayRequest();
        //SDK已经封装掉了公共参数，这里只需要传入业务参数
        $data = [
            "body" => $param['body'],
            "subject" => $param['subject'],
            "timeout_express" => "30m",
            "total_amount" => $param['total_amount'],
            "out_trade_no" => $param['out_trade_no']
        ];
        $request->setNotifyUrl('http://'.$_SERVER['HTTP_HOST'].'/user/Allot/appNotifys');
        $request->setBizContent(json_encode($data));
        //这里和普通的接口调用不同，使用的是sdkExecute
        $result = $aop->sdkExecute($request);
        //htmlspecialchars是为了输出到页面时防止被浏览器将关键参数html转义，实际打印到日志以及http传输不会有这个问题
        //就是orderString 可以直接给客户端请求，无需再做处理。
        return $result;
    }

    /**
     * APP-退款
     * @param $out_trade_no     订单支付时传入的商户订单号,不能和 trade_no同时为空
     * @param $refund_amount    订单支付总金额
     * @param $trade_no         支付宝交易号
     * @return bool|mixed|\SimpleXMLElement
     * @throws \Exception
     */
    public function refund($out_trade_no, $refund_amount, $trade_no = "")
    {
        $aop = new \AopClient();
        $aop->gatewayUrl = $this->gatewayUrl;
        $aop->appId = $this->appId;
        $aop->rsaPrivateKey = $this->rsaPrivateKey;
        $aop->alipayrsaPublicKey = $this->alipayrsaPublicKey;
        $aop->apiVersion = '1.0';
        $aop->postCharset = $this->charset;
        $aop->format = $this->format;
        $aop->signType = $this->signType;
        $request = new \AlipayTradeRefundRequest();
        $data = [
            'out_trade_no' => $out_trade_no,
            'trade_no' => $trade_no,
            'refund_amount' => $refund_amount,
        ];
        $request->setBizContent(json_encode($data));
        $result = $aop->execute($request);
        $responseNode = str_replace(".", "_", $request->getApiMethodName()) . "_response";
        $resultCode = $result->$responseNode->code;
        if (!empty($resultCode) && $resultCode == 10000) {
            $res = [
                'msg'               =>  $result->$responseNode->msg,
                'buyer_logon_id'    =>  $result->$responseNode->buyer_logon_id,     //用户的登录id
                'buyer_user_id'     =>  $result->$responseNode->buyer_user_id,      //买家在支付宝的用户id
                'fund_change'       =>  $result->$responseNode->fund_change,        //本次退款是否发生了资金变化
                'gmt_refund_pay'    =>  $result->$responseNode->gmt_refund_pay,     //退款支付时间
                'out_trade_no'      =>  $result->$responseNode->out_trade_no,       //商户订单号
                'refund_fee'        =>  $result->$responseNode->refund_fee,         //退款总金额
                'send_back_fee'     =>  $result->$responseNode->send_back_fee,      //(文档未找到)
                'trade_no'          =>  $result->$responseNode->trade_no            //支付宝交易号
            ];
            return $res;
        } else {
            return $result;
        }
    }
}