PHP WeChat payment front-end implementation process in WeChat mini program

With the advent of the mobile Internet era, WeChat has become an indispensable part of people's lives. Nowadays, WeChat payment has become a daily payment method of choice. PHP WeChat Payment in WeChat Mini Program has become one of the must-have options for merchants, providing more and more business opportunities for merchants. In this article, we will describe in detail the PHP WeChat payment front-end implementation process in the WeChat applet.

1. Introduction to WeChat payment process

1. Users open the merchant’s WeChat applet, select products and submit orders.
2. The order information is sent to the merchant's server.
3. The merchant server submits a payment request to the WeChat official payment interface and obtains the prepayment transaction number.
4. The merchant server returns the prepayment transaction number to the front end of the mini program.
5. The front-end data is signed using the merchant’s private key and submitted to the WeChat official payment platform.
6. The WeChat official payment platform verifies front-end data and signatures to ensure data integrity.
7. WeChat official payment platform initiates a payment request to the user’s WeChat account.
8. The user confirms the payment and the order is successfully completed.

2. WeChat payment front-end implementation process

1. Apply for interface calling permission on the WeChat payment official website, and obtain the merchant number, payment key and other information.
2. The WeChat payment API interface is called in the front-end code of the WeChat applet to obtain the current user information.
3. Send user information to the merchant server through AJAX.
4. The merchant server uses the WeChat payment API interface to perform secondary verification of user information.
5. Return the merchant number, payment key and other information to the front end of the WeChat applet in JSON format.
6. After obtaining the information returned by the merchant server, sign the payment information and private key.
7. Send the signed data to the official WeChat payment platform through AJAX.
8. The official WeChat payment platform verifies front-end data and signatures to ensure data integrity.
9. WeChat official payment platform initiates a payment request to the user’s WeChat account.
10. The user confirms the payment and the order is successfully completed.

3. PHP WeChat payment operation process

In order to implement the PHP WeChat payment operation, we need to know how to call the WeChat payment API and set up the payment environment. In this process, the following tools and environments are required:

1. PHP 5 and above.
2. Set APPID and SECRET.
3. Use SDK to implement API callbacks.
4. Set the callback URL of the WeChat payment interface.
5. Call the WeChat payment API and generate payment data with signature.

The following is the operation process of implementing PHP WeChat payment:

1. Download the PHP WeChat payment SDK.
2. Configure callback URL and payment key.
3. Call the API and generate payment data with signature.

4. Solutions to common problems

During the WeChat payment process, some common problems may arise. Let’s introduce some solutions below.

1. SSL certificate issues: If you have SSL certificate related issues, you need to upgrade the OpenSSL version.
2. Interface calling problem: During the API calling process, if a problem occurs, you need to check the API parameters.
3. WeChat payment problem: During the WeChat payment process, if a payment problem occurs, you need to check the return value of the WeChat payment API interface.
4. Background service problems: If there are background service problems, you need to check whether the PHP version is correct and ensure that services such as APACHE or NGINX are running normally.

5. Conclusion

In this article, we describe in detail the PHP WeChat payment front-end implementation process in the WeChat applet. During the implementation process, you need to understand the WeChat payment process and the interaction process between the front and back ends. At the same time, we also introduced common problems and solutions, hoping to be helpful to you. WeChat Pay has become a necessary payment method for merchants. I hope that merchants can seize the opportunity to understand WeChat Pay and try to use WeChat mini programs to conduct business.

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