How to implement scan code payment in WeChat mini program with PHP

With the popularity of WeChat Mini Programs, more and more companies and individuals are developing their own products, services, content and other content into WeChat Mini Programs to provide more convenient, faster and safer services and services through WeChat Mini Programs. Interaction. Among them, the scan code payment function in WeChat mini programs has become a problem that many mini program developers and operators must face and solve.

As a very popular back-end development language, PHP can also support and implement the scan code payment function of WeChat applet. So, how does PHP implement scan code payment in WeChat mini program? This article will introduce and analyze the basic principles, technical implementation and development process.

1. The basic principle of scan code payment in the WeChat applet

Scan code payment in the WeChat applet is essentially a payment method that uses the WeChat payment interface and the server for payment interaction , and finally complete the payment process. The scan code payment in the WeChat applet goes through the following steps:

1. The cashier places an order in the WeChat applet and selects "payment method" as "scan code payment".
2. The system generates a QR code and displays it on the page.
3. Customers use WeChat to scan the QR code.
4. The WeChat payment system completes the payment process through the payment interaction process.

In this process, you need to understand the main components of scan code payment in the WeChat applet, including "merchant number", "appid", "payment key", etc. These parameters need to be set in the code to ensure normal payment.

2. Technical implementation of scan code payment in WeChat applet using PHP

After understanding the basic principles of scan code payment in WeChat applet, we can talk about how to use it PHP implementation:

1. First determine the merchant number and payment key

The payment key is a key generated by the WeChat payment system from the merchant platform and is used in the WeChat applet Data encryption and signature verification for scan code payment. The merchant number is a unique identification number registered and set in the WeChat payment platform to distinguish different merchants.

2. Write PHP code to implement the scan code payment function

In the PHP code, you need to use technologies such as curl and xml processing, and use the WeChat payment interface to perform scan code payment related operations. The main code is as follows:

//Step 1: Construct the parameters of WeChat payment

$params = ['appid' => 'wx1xxxxxxxxxxxxxxxxxx',

'mch_id' => '12345xxxx',

'nonce_str' => md5(time()), //Random number

'body' => 'Test product name',

'out_trade_no' => time() . rand(1000, 9999),

'total_fee' => '1', //in minutes

' spbill_create_ip' => '127.0.0.1',

'notify_url' => 'http://www.example.com/paycallback.php',

'trade_type' => ; 'NATIVE', //Scan code payment type

'product_id' => '123456' //Product ID, must be filled in when the type is NATIVE

];

//Step 2: Sign the parameters

$str = '';

foreach ($params as $key => $value) {

$str .= "{$key}={$value}&";

}

$str .= "key=12345gxxxxxxxxxxxxxxx"; //Add payment key

$params['sign'] = strtoupper(md5($str)); //Signature

//Step 3: Convert the parameters to xml format

$xml = '';

foreach ($params as $key => $value) {

$xml .= "<{$key}>{$value}";

}

$xml = "{$xml}";

//Step 4 : Request the payment interface and perform corresponding processing

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://api.mch.weixin.qq.com /pay/unifiedorder');

curl_setopt($ch, CURLOPT_POST, true);

curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);

curl_setopt($ch , CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

$str = curl_exec($ ch);

//Step 5: Process the returned results

if ($str === false) {

echo 'Curl error: ' . curl_error ($ch);

} else {

//Convert the result to an array and process it

$arr ​​= json_decode(json_encode(simplexml_load_string($str)), true );

//Determine whether the result is successful, the code_url field will be returned only if it is successful

if ($arr['return_code'] == 'SUCCESS' && $arr['result_code'] = = 'SUCCESS') {

echo $arr['code_url'];

} else {

echo 'Payment request failed';

}

}

//Step 6: Close curl

curl_close($ch);

3. PHP implements code scanning in WeChat applet Payment development process

Based on the above, PHP implements scan code payment in WeChat mini program, which requires the following development process:

1. Prepare the technical elements and software and hardware environment required for development .
2. Set up the merchant account and payment key for WeChat payment.
3. Write code related to scan code payment in PHP code.
4. Test and debug the written code.
5. Go online and switch to a formal account and test.

It should be noted that during the development and testing process, we need to pay attention to the security measures and related policy requirements of WeChat payment to ensure the security and compliance of payment. At the same time, in order to improve users’ payment experience and stability, the best practices and technical specifications of WeChat Payment should also be followed.

In short, PHP's implementation of QR code payment in WeChat mini-programs is a very applicable and meaningful technology, which can help developers and operators provide users with more convenient, faster and reliable payment interaction services. This will lay a solid foundation for the development and promotion of WeChat mini programs.

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