支付宝退款背后的秘密

官方接口文档：
退款接口： https://opendocs.alipay.com/apis/api_1/alipay.trade.refund
支付订单查询接口：https://opendocs.alipay.com/apis/api_1/alipay.trade.query

示例代码如下：
<?php

/**
 * 扫码支付
 * 提醒：提交支付请求后微信会同步返回支付结果（没有异步回调通知）。当返回结果为“系统错误”时，商户系统等待5秒后调用【查询订单API】，查询支付实际交易结果；当返回结果为“USERPAYING”时，商户系统可设置间隔时间(建议10秒)重新查询支付结果，直到支付成功或超时(建议30秒)；
 */
namespace app\api\controller;
use think\Controller;
use think\Db;
use think\Input;
use think\facade\Request;
use app\api\controller\Common;

header("Access-Control-Allow-Origin:*");
header("Content-type: text/html; charset=utf-8");
require_once $_SERVER['DOCUMENT_ROOT'].'/vendor/Alipaydangmianfu_demo/f2fpay/model/builder/AlipayTradePayContentBuilder.php';
require_once $_SERVER['DOCUMENT_ROOT'].'/vendor/Alipaydangmianfu_demo/f2fpay/service/AlipayTradeService.php';
require_once $_SERVER['DOCUMENT_ROOT'].'/vendor/Alipaydangmianfu_demo/aop/AopClient.php';
require_once $_SERVER['DOCUMENT_ROOT'].'/vendor/Alipaydangmianfu_demo/aop/request/AlipayTradeRefundRequest.php';
/**
 * 支付宝当面付
 * @package app\api\controller
 */
class Alipay
{
    /**
     * Notes:
     * User: 小海
     * Time:下午 1:51
     * DATE:2020/12/10 0010
     */
    public function alipay($authCode, $totalAmount, $outTradeNo)
    {
        $common = new Common();
        $config = array(
            //签名方式
            'sign_type' => "RSA2",
            //支付宝公钥
//            'alipay_public_key' => "/fEsraprwCtzvzQETrNRwVxLO5jVmRGi60j8Ue1efIlzPXV9je9mkjzOmdssymZkh2QhUrCmZYI/FCEa3/cNMW0QIDAQAB",
            'alipay_public_key' => '+rHrXw7L+/HlesZSXoMsYRed7Ray6oFu/YjRTJ2e3zxkhcHjcy5pZIauuT5dz1vM6XA3q38VILGQZbK3RusYlcpNopbR5f6j8HOoIgSk3+qdmRgga2hgwhgd1JOj7R/aTmPGzTJ81E6FXCGN83PLnHYr0URgtnpjLVOg+xV5fiAeWGe9SOUasW3sfqFk54WRwBOcOm70Owl9+juDhGICJObdIxrbck0ij7xkSlU89/ZcUQQ4UNLSya6jghdF8oQzeeszHR0/QCYfWELTCoxUwH46RHy9rN0IOF5OkWUCVc7ga/kRuNl+Um1ryOPc3NUxwIDAQAB',
            //商户私钥
            'merchant_private_key' => "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",

            //编码格式
            'charset' => "UTF-8",

            //支付宝网关
            'gatewayUrl' => "https://openapi.alipay.com/gateway.do",

            //应用ID
            'app_id' => "123423",

            //异步通知地址,只有扫码支付预下单可用
            'notify_url' => "",

            //最大查询重试次数
            'MaxQueryRetry' => "10",

            //查询间隔
            'QueryDuration' => "3"
        );
        // (必填) 商户网站订单系统中唯一订单号，64个字符以内，只能包含字母、数字、下划线，
        // 需保证商户系统端不能重复，建议通过数据库sequence生成，
//        $outTradeNo = "Dsx" . date('Ymdhis') . mt_rand(100, 1000);
        $subject = "第三巷条形码支付";
//        $totalAmount = $_POST['payAmount'];    // (必填) 订单总金额，单位为元，不能超过1亿元

        // (必填) 付款条码，用户支付宝钱包手机app点击“付款”产生的付款条码
//        $authCode = $_POST['auth_code']; //28开头18位数字


        // 支付超时，线下扫码交易定义为5分钟
        $timeExpress = "5m";
        // 创建请求builder，设置请求参数
        $barPayRequestBuilder = new \AlipayTradePayContentBuilder();


        $barPayRequestBuilder->setOutTradeNo($outTradeNo);
        $barPayRequestBuilder->setTotalAmount($totalAmount);
        $barPayRequestBuilder->setAuthCode($authCode);
        $barPayRequestBuilder->setTimeExpress($timeExpress);
        $barPayRequestBuilder->setSubject($subject);
        // 调用barPay方法获取当面付应答
        $barPay = new \AlipayTradeService($config);
        $barPayResult = $barPay->barPay($barPayRequestBuilder);
        switch ($barPayResult->getTradeStatus()) {
            case "SUCCESS":
//                echo "支付宝支付成功:" . "<br>--------------------------<br>";
                $data = $barPayResult->getResponse();
                $result = $common->returnway(2000, "支付宝支付成功！", $data);
                return json_encode($result);
                break;
            case "FAILED":
//                echo "支付宝支付失败!!!" . "<br>--------------------------<br>";
                if (!empty($barPayResult->getResponse())) {
                    $data = $barPayResult->getResponse();
                    $result = $common->returnway(2002, "支付宝支付失败！", $data);
                    return json_encode($result);
                }
                break;
            case "UNKNOWN":
//                echo "系统异常，订单状态未知!!!" . "<br>--------------------------<br>";
                if (!empty($barPayResult->getResponse())) {
                    $result = $common->returnway(4000, "系统异常，订单状态未知！", $barPayResult->getResponse());
                    return json_encode($result);
                }
                break;
            default:
                echo "不支持的交易状态，交易返回异常!!!";
                break;
        }
        return;
    }

    /**
     * 支付宝退货处理
     * 退货前提是必须支付成功
     * @$out_trade_no		平台订单号
     * @$wepay_serial		支付宝交易号
     * @$totalFee  //退款金额
     */
    public function alipayRefund($out_trade_no, $wepay_serial, $totalFee)
    {
        $aop = new \AopClient ();
        $aop->gatewayUrl = 'https://openapi.alipay.com/gateway.do';
        $aop->appId = '12342312';
        $aop->alipayrsaPublicKey = '+rHrXw7L+/HlesZSXoMsYRed7Ray6oFu/YjRTJ2e3zxkhcHjcy5pZIauuT5dz1vM6XA3q38VILGQZbK3RusYlcpNopbR5f6j8HOoIgSk3+qdmRgga2hgwhgd1JOj7R/aTmPGzTJ81E6FXCGN83PLnHYr0URgtnpjLVOg+xV5fiAeWGe9SOUasW3sfqFk54WRwBOcOm70Owl9+juDhGICJObdIxrbck0ij7xkSlU89/ZcUQQ4UNLSya6jghdF8oQzeeszHR0/QCYfWELTCoxUwH46RHy9rN0IOF5OkWUCVc7ga/kRuNl+Um1ryOPc3NUxwIDAQAB';
        $aop->rsaPrivateKey = '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';
        $aop->apiVersion = '1.0';
        $aop->signType = 'RSA2';
        $aop->postCharset = 'UTF-8';
        $aop->format = 'json';
        $request = new \AlipayTradeRefundRequest ();
        $bizcontent = json_encode([
            'out_trade_no' => $out_trade_no,
            'trade_no' => $wepay_serial,
            'refund_amount' => $totalFee,
            'refund_reason' => '正常退款'
        ]);

        $request->setBizContent($bizcontent);
        $result = $aop->execute($request);
        $responseNode = str_replace(".", "_", $request->getApiMethodName()) . "_response";
        $resultCode = $result->$responseNode->code;
        if (!empty($resultCode) && $resultCode == 10000) {
            return 1000;
        } else {
            return -1;
        }


    }
}

在你的管理后台调取支付类中的alipayRefund（）即可！每天带你们了解咱们周围常见产品的实现原理，不明白的地方可以私聊我！