1、支付是否成功判断
public function validate_apple_pay($receipt_data){
        /**
         * 21000 App Store不能读取你提供的JSON对象
         * 21002 receipt-data域的数据有问题
         * 21003 receipt无法通过验证
         * 21004 提供的shared secret不匹配你账号中的shared secret
         * 21005 receipt服务器当前不可用
         * 21006 receipt合法,但是订阅已过期。服务器接收到这个状态码时,receipt数据仍然会解码并一起发送
         * 21007 receipt是Sandbox receipt,但却发送至生产系统的验证服务
         * 21008 receipt是生产receipt,但却发送至Sandbox环境的验证服务
         */
        function acurl($receipt_data, $sandbox=0){
            //小票信息
            $POSTFIELDS = array("receipt-data" => $receipt_data,'password'=>'8bc1988761044b279affc4250645aba2');
            $POSTFIELDS = json_encode($POSTFIELDS);

            //正式购买地址 沙盒购买地址
            $url_buy     = "https://buy.itunes.apple.com/verifyReceipt";
            $url_sandbox = "https://sandbox.itunes.apple.com/verifyReceipt";
            $url = $sandbox ? $url_sandbox : $url_buy;
//            $url = $url_sandbox;
            //简单的curl
            $ch = curl_init($url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $POSTFIELDS);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
            $result = curl_exec($ch);
            curl_close($ch);
            return $result;
        }
        // 验证参数
        if (strlen($receipt_data)<20){
            $result=array(
                'status'=>false,
                'message'=>'非法参数'
            );
            return $result;
        }
        // 请求验证
        $html = acurl($receipt_data);
        $data = json_decode($html,true);
        // 如果是沙盒数据 则验证沙盒模式
        if($data['status']=='21007'){
            // 请求验证
            $html = acurl($receipt_data, 1);
            $data = json_decode($html,true);
            $data['sandbox'] = '1';
        }

        if (isset($_GET['debug'])) {
            exit(json_encode($data));
        }
        if(empty($data)){
            $result=array(
                'status'=>false,
                'message'=>'error'
            );
            return $result;
        }
        // 判断是否购买成功
        if(intval($data['status'])===0){
            $result=array(
                'status'=>true,
                'message'=>'购买成功',
                'info'=>json_encode($data),
            );
        }else{
            $result=array(
                'status'=>false,
                'message'=>'购买失败 status:'.$data['status']
            );
        }
        return $result;
    }
2、调用
public function apppay()
    {
        $param = $_POST['param'];
        $res = $this->validate_apple_pay($param);
        if($res['status']){ok}else{error}
}

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