What to do if php WeChat payment signature fails

PHP WeChat payment signature failed

With the rapid development of mobile payment, WeChat payment has become a payment method chosen by more and more people. However, when using PHP to implement WeChat payment, you may encounter the problem of signature failure. This article will introduce some solutions.

1. Check the key and certificate

When using WeChat payment, you need to set parameters such as the merchant number and key. If the signature is wrong, it may be caused by a wrong key.

First, check whether the merchant number and key are correct. Secondly, if you need to use a certificate, you need to check whether the certificate is imported successfully and whether the certificate password is correct.

2. Check data format

When making WeChat payment, the relevant parameters need to be passed in the specified format. If the parameter format is incorrect, it will also cause the signature to fail.

When constructing payment parameters, you need to pay attention to the following points:

• The ASCII codes of parameter names are sorted from small to large (lexicographic order);
• If the value of the parameter Contains Chinese and must be URL encoded;
• The parameter name and parameter value are connected with "=", and the parameters are connected with "&";
• Finally, the merchant key needs to be added for SHA1 signature.

3. Set the correct signature method

WeChat payment signature has two methods: MD5 and HMAC-SHA256. The signature method needs to be set according to the actual situation.

If an error message indicating a signature failure is returned when making WeChat payment, you can view the err_code_des parameter in the return result to get more detailed error information to help troubleshoot the problem.

4. Check the timestamp and random string

When making a payment request, you need to set the random string and timestamp. If the timestamp expires or the random string is invalid, May cause signature failure.

In PHP code, you can use the time() function to obtain the current timestamp and the rand() function to generate a random string.

5. View PHP version and extension

When using PHP to implement WeChat payment, you need to ensure that the PHP version is higher than 5.4, and the curl extension needs to be enabled.

If a signature failure occurs, you can check the current PHP version and enabled extensions by executing the phpinfo() function to troubleshoot the problem.

6. Refer to the WeChat Payment Development Document

If none of the above methods can solve the problem of signature failure, you can refer to the WeChat Payment official document to find a more detailed solution, or contact WeChat Pay support team for help.

Summary

There are many reasons why PHP WeChat payment signature fails, but most of them can be solved by checking the key and certificate, checking the data format, setting the correct signature method, checking the timestamp and randomness string, check the PHP version and extension, and refer to the WeChat payment development documentation to solve it. If the problem still cannot be solved, you can contact the WeChat payment support team.

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