How to develop Alipay in PHP?

Alipay is one of the largest third-party payment platforms in China, with hundreds of millions of users. Developers can conduct Alipay-related development through the developer interface provided by Alipay. This article will introduce how to develop Alipay in PHP.

1. Get an Alipay developer account

To start Alipay development, you need to first become an Alipay developer and create a developer account. To create an account, please visit Alipay Open Platform (https://open.alipay.com/), click "Developer Center" and create an account.

Once your account is created and offline, you can use it to create applications and obtain the necessary API keys.

2. Get API Key

In order to use Alipay’s API, you need the key. In the "Developer Center" of the Alipay Open Platform, select "Key Management" and create a new key for accessing the API. Select "Create Key" and fill in the necessary information, and your public and private keys will be created. Please keep your private key safe and do not disclose it to third parties.

3. Download and introduce Alipay SDK

The Alipay application is built based on the SDK. Download the latest PHP SDK from Alipay Open Platform and introduce it into your project according to the official documentation. Remember to create a new SDK instance with your API key.

4. Client recharge

To allow users to recharge, you need to generate pre-recharge orders for them on your server side. The order can be requested using the AlipayTradePagePayRequest class in the SDK.

The following is an example of generating an order:

<?php
require_once 'AlipaySdk.php';
$outTradeNo = '123456789'; //　您的订单号

$request = new AlipayTradePagePayRequest();
$request->setReturnUrl("http://localhost/callback.php");  //　服务器回调地址
$request->setNotifyUrl("http://localhost/notify.php");  //　支付宝回调地址

$request->setBizContent("{" .
    "    "out_trade_no":"$outTradeNo"," .
    "    "product_code":"FAST_INSTANT_TRADE_PAY"," .
    "    "total_amount":88.88," .
    "    "subject":"test subject"," .
    "    "body":"test body"" .
    "  }");

$response = $aliPay->execute($request);
echo $response;

In the next steps, you need to create a callback handler to handle Alipay notifying your server of the payment status. You need to find related orders in the database based on the order number, then update the order status and perform necessary business logic operations based on the payment results.

5. Refunds

Your application may be subject to a refund. You can use the AlipayTradeRefundRequest class to send an order refund request to Alipay.

Here is an example of a refund request:

<?php
$request = new AlipayTradeRefundRequest();
$request->setBizContent("{" .
    "    "out_trade_no":"$outTradeNo"," .   //　订单号
    "    "refund_amount":8.88," .             //　退款金额
    "    "refund_reason":"reason"," .       //　退款原因
    "    "out_request_no":"uniqueRefundId"" .   //　退款单号
    "  }");
$response = $aliPay->execute($request);

Next, you need to mark the refund as completed in the order record.

Conclusion

Alipay is a very convenient payment solution that is suitable for various transaction types, including payments, transfers, and refunds. PHP developers can easily develop using Alipay’s API. The steps introduced in this article can help PHP developers understand how to start Alipay payment-related development.

The above is the detailed content of How to develop Alipay in PHP?. For more information, please follow other related articles on the PHP Chinese website!