The signature of WeChat payment refers to the character string generated by the signature of payment parameters, which is used to ensure the integrity and security of information in the payment process. In WeChat payment, the signature algorithm is HMAC algorithm based on SHA256. Therefore, the signature of WeChat payment contains the private key of the merchant and the parameters in the transaction process as inputs, and the generated signature string will be compared with the signature returned by WeChat server to ensure that the transaction is legal and has not been tampered with.

The significance of WeChat payment signature lies in the integrity protection of data packets. Wechat payment is based on HTTP protocol, transmitted in clear text and easily tampered with. By signing the transmitted parameters, the data can be guaranteed not to be tampered with in the middle, and the source of the data can be verified to prevent forgery. For example, the signature of WeChat payment is like a sealed envelope, which protects the transaction information during the transaction from any interference.

How to generate the signature of WeChat payment?

To generate the signature of WeChat payment, you need to obtain the merchant's private key and transaction parameters first. Then the parameters are sorted according to ASCII code, and all parameters are spliced into a string in the form of key-value pairs. Finally, the HMAC_SHA256 algorithm is called, and a signature result is obtained by using the merchant key as the key and the parameter string as the input. The signature result is a generated signature. According to the algorithm provided by the official payment document of WeChat, the transaction can proceed normally.