1. Log in to the WeChat open platform and click "Management Center" in the upper right corner of the page to enter the management page.
2. Select "Development and Cooperation" in the left menu bar and click "Developer Documentation".
3. On the developer's documentation page, find the Signature Generation Rule and click Enter.
4. On the page of signature generation rules, you can see the detailed description of signature generation rules.
5. It can be seen that the signature is a character string used to identify the identity of the developer, which is provided by the WeChat open platform, and the developer should set it according to the rules.
6. According to the signature rules, set the signature correctly in the code.