How to use PHP for Alipay development?

With the rapid development of e-commerce, more and more companies and individuals are beginning to use Alipay for online payments. In response to this trend, PHP provides many convenient development tools and libraries, making it easier for us to develop Alipay applications. This article will introduce readers to how to use PHP for Alipay development.

1. Apply for an Alipay developer account

Before starting to use PHP for Alipay development, we need to apply for an Alipay developer account. Visit the Alipay open platform (https://open.alipay.com/) and follow the instructions to register an account, complete real-name authentication and create an application.

2. Download and install the SDK

The Alipay open platform provides PHP SDK, which can be found on GitHub (https://github.com/alipay/alipay-sdk-php). After downloading, unzip it to any directory and use it.

3. Configure the application

After creating the application, Alipay will provide some necessary information, and we need to fill this information into the SDK configuration file. Copy the config.php file in the SDK directory and name it custom_config.php, then open the editor for editing and set the following parameters:

'merchant_private_key' => '填写您的应用的私钥',

'alipay_public_key' => '填写支付宝公钥',

'app_id' => '填写您的应用的AppId',

where merchant_private_key is the application private key generated through the application management interface; alipay_public_key is the Alipay public key, which is also downloaded through the application management interface; app_id is the application ID automatically generated when creating the application.

In addition, you need to add the directory of the custom_config.php file to the include_path parameter of PHP. You can set it in the php.ini file or use the ini_set function in the code.

4. Using SDK

After completing the installation and configuration of the SDK, we can start using the SDK for Alipay development. The following demonstration will be based on Alipay's instant payment interface.

1. Prepare request parameters

First, we need to prepare some request parameters. Here, we only need to set the necessary parameters, including merchant order number (out_trade_no), order name (subject), payment amount (total_amount) and product description (body).

$out_trade_no = '20180701001';

$subject = '测试商品';

$total_amount = '10.00';

$body = '这是一个测试商品';

In actual applications, these parameters may need to be obtained from user input, database query, or other methods.

2. Create payment link

Next, we can create a payment link and jump to the Alipay payment page. Use the AlipayTradePagePayRequest class in the SDK, set the corresponding parameters, and then call the pageExecute method.

$request = new AlipayTradePagePayRequest();

$request->setNotifyUrl('http://localhost/notify.php');

$request->setReturnUrl('http://localhost/return.php');

$request->setBizContent(json_encode([

    'out_trade_no' => $out_trade_no,

    'product_code' => 'FAST_INSTANT_TRADE_PAY',

    'total_amount' => $total_amount,

    'subject' => $subject,

    'body' => $body,

]));

$response = $aop->pageExecute($request);

In the above code, we set the return and notification URLs, use the product code FAST_INSTANT_TRADE_PAY, and set other parameters to previously prepared variables.

3. Processing payment results

Finally, we need to process the payment results in the returned and notified URLs. In these pages, some parameters will be passed, and we need to verify the signature, parse the parameters, process the business logic and return the corresponding results. Here is the sample code for notify.php page:

$params = $_POST;

$sign = $params['sign'];

unset($params['sign_type'], $params['sign']);

if (!$aop->rsaCheck($params, $sign)) {

    exit;

}

// 处理业务逻辑

echo 'success';

In this code, we first get the POST parameters and then verify the signature. If the signature verification fails, exit the page. If the signature verification is successful, you can continue to process the business logic and return success to indicate successful processing. The codes for the return.php page and the notify.php page are similar and will not be described again.

5. Summary

It is not difficult to develop Alipay using PHP. The main work is to install the SDK, configure parameters and call the API. The above content is just a simple example. In actual use, different interfaces may need to be called according to different business requirements. When developing Alipay, you must pay attention to security issues to ensure the safety of data transmission and storage.

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