How to implement payment function in PHP

As the e-commerce industry continues to develop, the payment function has become an indispensable function on any e-commerce platform. Implementing payment functions in PHP is undoubtedly one of the necessary skills for every PHP developer. The following will introduce how to use PHP to implement payment functions.

1. Choose a payment platform

First, you need to choose a payment platform. When choosing a payment platform, you need to consider the following factors:

Fees: Some payment platforms will charge a certain fee for the payment amount.

Supported payment methods: The more payment methods supported, the higher the flexibility for users to use the payment function.

Ease of use: Some payment platforms have a more complex process, while others are more straightforward.

Regarding the choice of payment platform, the more common ones currently on the market include Alipay, WeChat Pay, UnionPay, etc. Here we take Alipay as an example to introduce how to use PHP to implement payment functions.

2. Register on the open platform

When using Alipay to pay, you need to register an account on the Alipay open platform first. The specific steps are as follows:

Enter the official website of Alipay Open Platform (https://open.alipay.com/) and click "Register" in the upper right corner to open an account.

Fill in the company information and contact information, and follow the page prompts to upload your certificate and verify it.

Open the application and set application parameters, obtain AppID, application private key and public key, etc.

3. Integrate Alipay SDK

To use Alipay payment in PHP, you usually need to use the development tool kit (SDK) provided by Alipay. The SDK includes some basic methods and APIs that can help us use Alipay payment functions more conveniently. The method to install the SDK is as follows:

(1) Download the SDK from https://github.com/alipay/alipay-sdk-php.

(2) Unzip the SDK and place the file into the project and load it through require.

4. Writing PHP code

The Alipay open platform provides a wealth of APIs, and you can decide which APIs to use based on business needs. Here, PHP is used to implement instant payment transaction orders in the Alipay sandbox environment. The specific implementation method is as follows:

First, obtain the APPID and private key, and use the SDK provided by Alipay to initialize. The code is as follows:

    require_once '/path/to/alipay-sdk-PHP/AopSdk.php';

    $aop = new AopClient();
    $aop->gatewayUrl = 'https://openapi.alipaydev.com/gateway.do';
    $aop->appId = '应用ID';
    $aop->rsaPrivateKeyFilePath = '应用私钥文件路径';
    $aop->alipayPublicKeyFilePath = '支付宝公钥文件路径';
    $aop->apiVersion = '1.0';
    $aop->signType = 'RSA2';
    $aop->postCharset='UTF-8';

Then, construct the business parameters and send the payment request. The sample code is as follows :

    $bizcontent = [
        'body'            => '这是商品描述',
        'subject'         => '这是商品名称',
        'out_trade_no'    => '这是商户网站唯一订单号',
        'total_amount'    => '此处填写订单总金额，精确到小数点后两位',
        'product_code'    => 'FAST_INSTANT_TRADE_PAY',
    ];

    $request = new AlipayTradePagePayRequest();
    $request->setReturnUrl('同步回调URL');
    $request->setNotifyUrl('异步回调URL');
    $request->setBizContent(json_encode($bizcontent));

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

In the above code, the $bizcontent variable contains related order information, in which the total_amount field must be a numeric type and the unit is yuan. The $request variable constructs the payment request and sets the URL of the synchronous/asynchronous callback.

5. Receive payment results

After the Alipay payment is successful, the merchant application will be notified of the payment result in two ways: asynchronous notification and synchronous notification. Asynchronous notification is a necessary step to implement business logic, because in some cases, Alipay will send asynchronous notification multiple times. Synchronous notification user experience is better, but unreliable. For how to receive payment results, please refer to the relevant documents provided by Alipay.

Summary

This article introduces how to use PHP to implement Alipay payment function. Generally speaking, the payment function can be easily implemented using the SDK provided by the Alipay open platform. During specific implementation, it is necessary to select a payment platform and corresponding payment method according to business needs, and follow the relevant rules and precautions of the payment platform.

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