如何使用PHP和OAuth进行微信支付集成

composer require thephpleague/oauth2-client

<?php
class Config {
    public static $wechatPayConfig = [
        'clientId'          => 'YOUR_CLIENT_ID',
        'clientSecret'      => 'YOUR_CLIENT_SECRET',
        'redirectUri'       => 'YOUR_REDIRECT_URI',

        'wechatPayApiUrl'   => 'https://api.mch.weixin.qq.com/pay/unifiedorder',
        'wechatPayAppId'    => 'YOUR_APP_ID',
        'wechatPayMchId'    => 'YOUR_MCH_ID',
        'wechatPayApiKey'   => 'YOUR_API_KEY'
    ];
}
?>

<?php
require 'vendor/autoload.php';
use LeagueOAuth2ClientProviderGenericProvider;

$provider = new GenericProvider([
    'clientId'                => Config::$wechatPayConfig['clientId'],
    'clientSecret'            => Config::$wechatPayConfig['clientSecret'],
    'redirectUri'             => Config::$wechatPayConfig['redirectUri'],
    'urlAuthorize'            => 'https://open.weixin.qq.com/connect/oauth2/authorize',
    'urlAccessToken'          => 'https://api.weixin.qq.com/sns/oauth2/access_token',
    'urlResourceOwnerDetails' => 'https://api.weixin.qq.com/sns/userinfo'
]);

// 获取授权码
if (!isset($_GET['code'])) {
    $authorizationUrl = $provider->getAuthorizationUrl();
    $_SESSION['oauth2state'] = $provider->getState();
    header('Location: ' . $authorizationUrl);
    exit();
}

try {
    $accessToken = $provider->getAccessToken('authorization_code', [
        'code' => $_GET['code']
    ]);

    $resourceOwner = $provider->getResourceOwner($accessToken);
    $openid = $resourceOwner->getValues()['openid'];

    // TODO: 将openid保存到数据库中
} catch (Exception $e) {
    // 错误处理
}
?>

<?php
require 'vendor/autoload.php';

$wechatPay = new WechatPay(Config::$wechatPayConfig);
$prepayInfo = $wechatPay->unifiedOrder([
    'body'             => '支付测试',
    'out_trade_no'     => time(),
    'total_fee'        => '1',
    'spbill_create_ip' => $_SERVER['REMOTE_ADDR'],
    'notify_url'       => 'http://www.example.com/notify.php',
    'trade_type'       => 'JSAPI',
    'openid'           => $openid
]);

$prepayParams = $wechatPay->getJSSDKParams($prepayInfo['prepay_id']);

// 将$prepayParams传递给前端进行支付
?>

<?php
require 'vendor/autoload.php';
use WechatPayNotify;

$notify = new Notify(Config::$wechatPayConfig);
$notifyResult = $notify->handleNotify(); // 处理支付结果通知

if ($notifyResult) {
    // TODO: 更新数据库中的订单状态
    echo 'success'; // 返回给微信服务器，表示已成功处理通知
} else {
    // TODO: 删除数据库中的订单，或者进行其他处理
    echo 'fail';
}
?>