How to use PHP to implement order payment and refund functions

With the rise of e-commerce, order payment and refund functions have become an indispensable part of major e-commerce platforms. As a commonly used back-end language, PHP can also easily implement order payment and refund functions. This article will introduce how to use PHP to implement these functions.

1. Implementation of the order payment function

Before implementing the order payment function, we need to first understand the payment process. Generally speaking, the payment process includes the following steps:

1. The user initiates a payment request
2. The system generates an order and returns it to the user
3. The user jumps to payment Complete the payment on the page, or choose other payment methods
4. The payment platform accepts the user's payment request and returns the payment result to the system
5. The system updates the order status and completes the payment process

Next, we will implement the above steps step by step.

1. User initiates payment request

When the user selects a product on the e-commerce website, he or she needs to perform a payment operation. We can generate an order by passing some parameters. The sample code is as follows:

$amount = 100; //订单金额
$orderId = time(); //生成订单号
$params = array(
    'amount' => $amount,
    'orderId' => $orderId,
    //其他参数
);

//将参数传递给支付方式

2. The system generates an order and returns it to the user

After receiving the user’s payment request, we need to generate an order and return the order to the user . The sample code is as follows:

$order = array(
    'id' => $orderId,
    'amount' => $amount,
    'status' => 'unpaid',
    //其他订单信息
);

//将订单信息返回给用户

3. The user jumps to the payment page to complete the payment, or choose other payment methods

After the order information is returned to the user, the user can choose to jump Go to the payment page to pay, or choose another payment method. Here we take Alipay as an example. The sample code is as follows:

$gateway = 'http://pay.alipay.com'; //支付网关
$method = 'alipay.trade.page.pay'; //接口名称
$appId = 'xxxx'; //应用ID
$merchantPrivateKey = 'xxxx'; //商户私钥
$alipayPublicKey = 'xxxx'; //支付宝公钥

$request = array(
    'out_trade_no' => $orderId, //商户订单号
    'total_amount' => $amount, //订单总金额，单位为元，精确到小数点后两位
    'subject' => 'xxxx', //订单标题
    'body' => 'xxxx', //订单描述
    'product_code' => 'FAST_INSTANT_TRADE_PAY', //产品码，固定值
);

$alipayClient = new DefaultAlipayClient($gateway, $appId, $merchantPrivateKey, $format, $charset, $alipayPublicKey, $signType);
$request = new AlipayTradePagePayRequest ();
$request->setBizContent(json_encode($requestParams));
$request->setNotifyUrl('xxxx'); //异步通知地址
$request->setReturnUrl('xxxx'); //同步通知地址
$response = $alipayClient->pageExecute($request);
echo $response; //输出HTML代码，跳转至支付宝支付页面

4. The payment platform accepts the user’s payment request and returns the payment result to the system

After the user completes the payment, the payment platform The payment result will be returned to the system. We can receive the results returned by the payment platform through asynchronous notification. The sample code is as follows:

if($_POST['trade_status'] == 'TRADE_SUCCESS'){
    $orderId = $_POST['out_trade_no']; //商户订单号
    $amount = $_POST['total_amount']; //订单金额
    //更新订单状态等操作
}

5. The system updates the order status and completes the payment process

According to the results returned by the payment platform, we can update the order status and complete the payment process. The sample code is as follows:

if($response->getTradeStatus() == 'TRADE_SUCCESS'){
    $orderId = $response->getOutTradeNo(); //商户订单号
    $amount = $response->getTotalAmount(); //订单金额
    //更新订单状态等操作
}

2. Implementation of the order refund function

In the e-commerce platform, order refund is also a very important part. Below we will introduce how to use PHP to implement the order refund function.

1. Initiate a refund request

When a user needs a refund, we need to first receive the user's refund request and initiate a refund request to the payment platform. The sample code is as follows:

$orderId = 'xxxx'; //订单号
$refundAmount = 100; //退款金额
$params = array(
    'orderId' => $orderId,
    'refundAmount' => $refundAmount,
    //其他退款参数
);

//将参数传递给支付方式

2. The payment platform accepts the refund request and returns the refund result to the system

After completing the refund request, the payment platform will send the refund result Return to the system. We also need to receive the refund result through asynchronous notification. The sample code is as follows:

if($_POST['refund_status'] == 'REFUND_SUCCESS'){
    $orderId = $_POST['out_trade_no']; //商户订单号
    $refundAmount = $_POST['refund_amount']; //退款金额
    //更新订单状态等操作
}

3. The system updates the order status and completes the refund process

According to the results returned by the refund platform, we can update the order status and complete the refund process . The sample code is as follows:

if($response->getRefundStatus() == 'REFUND_SUCCESS'){
    $orderId = $response->getOutTradeNo(); //商户订单号
    $refundAmount = $response->getRefundAmount(); //退款金额
    //更新订单状态等操作
}

Summary

This article introduces how to use PHP to implement order payment and refund functions. Among them, order payment includes multiple steps such as the user initiating a payment request, the system generating the order and returning it to the user, the user jumping to the payment page to complete the payment, the payment platform accepting the user's payment request and returning the payment result to the system, and the system updating the order status; Order refund includes initiating a refund request, the payment platform accepting the refund request and returning the refund result to the system, and the system updating the order status. I hope this article will be helpful to PHP developers.

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