How to write WeChat payment interface development program in PHP

The WeChat payment interface is now slowly becoming like Alipay, which can use the API interface to implement third-party websites or applications for payment. The following is a php WeChat payment interface development program and has been tested. Interested friends can Please refer to

php WeChat payment interface development program explanation:

Required conditions:
appid //obtained from the official account backend developer center (Same as the one in the email)

mchid//Obtained in the email

key//Set up by the merchant backend

appsecret //Obtained in the official account developer center
Two certificate files, apiclient_cert.pem and apiclient_key.pem are obtained in the email
Notes:
Official account background WeChat payment - "Development configuration -" Add test directory and test personal WeChat account.
Developer Center-》Web page authorization to obtain basic user information-》Change to your test domain name. Otherwise, a redirect_uri parameter error will occur
——————————Follow-up to be improved——————-
The WeChat payment ready page has performed three operations on its own in the background:

1. Obtain openid

When I first started, I also encountered problems in the first step, unable to obtain openid. Related to some servers, the demo uses the curl acquisition method.
It’s strange that my server curl has been unable to be obtained. Later, it was changed to file_get_contents and it can be obtained normally.
But this is not the solution. Because more curl operations will be needed later.
I saw a place in the development documentation where the certificate operation requires libcurl 7.20.1 or above. Then I have been working on the server to improve the php curl version of Linux. In the end, I just switched to another windows server.
Let’s do this for the time being, and debug it when we need to use it next time.

Second step: Get and pay order number id
The code is as follows

This step also encounters Got a lot of questions.
First of all, it is difficult to test WeChat payment, and it can only be tested within WeChat. I just use my phone to swipe around.
Secondly, it is not easy to use var_dump for debugging. Printing some files in xml format only displays the character length, not the content. So I wrote it in the form of log for debugging on the server. The log code:
The code is as follows

Use $this- in WxPayPubHelper.php in the demo >log_d(xxx); called.
At the beginning, I kept getting errors because the mchid and appid given to me did not match. . They gave me the wrong account number. At the beginning, I didn’t know how to try randomly. For this step of debugging, you can see the error code using var_dump($this->result); in getPrepayId().

The third step: Generate the payment front-end js code and put it on the web page:
The code is as follows

——————-Click to pay————————-

Another problem encountered in this part:
android returns "System: Access_denied", ios returns "access_control:not_allowed"
I searched a lot on Baidu. In fact, I have seen this thing for a long time and never noticed it!
The page that initiates the authorization request must be in the authorization directory and cannot exist in a subdirectory. Otherwise, an error will be returned
I placed the payment file in /domain name/pay/demo/
At the beginning, I always reached the end of /domain name/pay/ and thought that was enough. Support subdirectories, the result is not possible! .
————————Finally look at the picture below————

wxpay1
wxpay3
wxpay2

—— ————xmljs in the process——————–
Generation and payment order id to be submitted:
The code is as follows

After submission, the return is correct, which contains perpay_id:

The js used to generate payment:

Notification xml returned after successful payment:

Summary: The above is the entire content of this article, I hope it can be helpful to everyone Learning helps.

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