Looking at the open platform, the signature is the package name (casually filled in when the application is in a hurry), and its requirements are: for the secondary authentication of the current application, the developer can use the signature generation tool to directly obtain it from the mobile phone installed by the current application. The application signature is determined by the developer signing the keystore file of the application.
Therefore, use the signature generation tool to generate a. The official document contains the installation package of this tool:
Click Download to send apk to your mobile phone for installation. When opened, it looks like this:
Enter your package name, click the Get Signature button, and a signature (green) will be generated:
Copy it to the open platform and call it later (provided that the signature is generated when the project is packaged, otherwise it will not work and needs to be repackaged, that is, the signature in the project needs to be consistent with the signature of the open platform):