How to implement Alipay payment in PHP

With the continuous development of e-commerce, various online payment methods are also emerging. Alipay, as one of the most popular payment methods in China, has become an indispensable part of many e-commerce companies. This article will introduce how to implement Alipay payment function in PHP.

1. Register an Alipay development platform account

Before we start, we need to register an Alipay development platform account. Log in to the Alipay open platform (https://open.alipay.com/) and register or log in, then create an application and select mobile payment or PC web payment application. After successful creation, you can obtain relevant information such as APP ID and secret key.

2. Configure Alipay SDK

Next we need to download Alipay’s PHP SDK (https://docs.open.alipay.com/sdk/4.0.0/download/) and unzip it Then copy alipay-sdk-PHP-4.6.0.tar.gz to the project and introduce the SDK. After introducing the SDK, you need to configure the SDK, including application APP ID, private key, Alipay public key and other information.

<?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();

3. Initiate a payment request

Next we need to initiate an Alipay payment request. First, you need to construct payment request parameters, including order number, total order amount, product title, product description and other information.

<?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);

4. Processing payment results

After Alipay payment is completed, the payment result will be notified to our server through asynchronous notification. We need to process the payment results and update the order status based on the payment results. The code for processing the payment results is as follows:

<?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';
}

5. Summary

Through the above steps, we can successfully implement the Alipay payment function in PHP. Of course, in actual development, issues such as order generation, refunds, exception handling, etc. also need to be considered, which are beyond the scope of this article. In general, when using Alipay to pay, you must ensure that the payment amount is accurate and the payment results are processed in a timely manner.

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