How to use PHP and OAuth for WeChat payment integration

How to integrate WeChat payment using PHP and OAuth

Introduction:
With the popularity of mobile payment, WeChat payment has become the preferred payment method for many people. Integrating WeChat Pay into a website or application can provide users with a convenient payment experience. This article will introduce how to use PHP and OAuth for WeChat payment integration and provide relevant code examples.

1. Apply for WeChat Pay
Before using WeChat Pay, you first need to apply for a WeChat Pay merchant account and related keys. For the specific application process, please refer to the official documents of WeChat Pay.

2. Selection of PHP OAuth library
OAuth is an open standard for authorization, which allows users to authorize third-party applications to access their information. In WeChat Pay, OAuth is used in the process of user authorization login and payment. In PHP, there are many open source OAuth libraries to choose from, such as OAuth1 and OAuth2.

3. Install and configure the OAuth library

1. Download and install the OAuth library
   PHP has many excellent OAuth libraries to choose from, such as php-oauth2-client. It can be installed through composer. The specific installation command is as follows:

composer require thephpleague/oauth2-client

2. Configuring the OAuth library
   In the project, you need to create a Config.php file for the configuration of the OAuth library. This file needs to contain WeChat payment-related configuration information, such as merchant number, key, etc. The sample code is as follows:

<?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'
    ];
}
?>

4. Use OAuth for WeChat payment integration

1. Authorized login
   Before users can use WeChat payment, they first need to authorize the login. This can be achieved through the following code example:

<?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
}
?>

2. Initiate a payment request
   After the user authorizes the login, the user can initiate a payment request. This can be achieved through the following code example:

<?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
?>

3. Payment callback processing
   After the payment is successful, the WeChat server will call back the specified notify_url to notify the payment result. This can be achieved through the following code examples:

<?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';
}
?>

Summary:
Through the above steps, we can implement the WeChat payment function based on PHP and OAuth. First, implement user authorization login through OAuth and obtain the user's openid. Then, use openid and related parameters to make a payment request. Finally, in the payment result notification, the payment result is processed and the related order status is updated. Through this method, we can easily integrate WeChat payment in websites or applications.

The above is the code example of this article. I hope it will be helpful to you when using PHP and OAuth to integrate WeChat payment.

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