如何在PHP中实现支付宝支付

<?php

require __DIR__ . '/vendor/autoload.php';

use AlipayEasySDKKernelFactory;

$config = [
    'app_id' => '应用APP ID',
    //私钥
    'merchant_private_key' => '应用私钥',
    //异步回调通知URL
    'notify_url' => 'http://example.com/notify_url',
    'charset' => 'UTF-8',
    //支付宝公钥，在支付宝开放平台中获取
    'alipay_public_key' => '支付宝公钥',
];

$alipay = Factory::setOptions($config)->payment();

<?php

//构建支付请求参数
$orderData = [
    'subject'       => '订单标题',
    'out_trade_no'  => '订单号',
    'total_amount'  => '订单总金额',
    'body'          => '订单描述',
];
$response = $alipay->app()->pay($orderData);

<?php

//验证异步通知签名
$result = $alipay->verify();
if ($result) {
    if ($_POST['trade_status'] == 'TRADE_SUCCESS') {
        //支付成功，更新订单状态
    }
    echo 'success';
} else {
    echo 'fail';
}