[Public account source code] 2022 's latest public account calls back to the multi-domain name system

This is a multi-domain callback system for Weixin Official Accounts based on the ThinkPHP6.0 framework.
Weixin Official Accounts can only authorize 2 web domain names by default. This system can break through this limitation.
Use the same public account to connect to unlimited websites. The website backend supports callback domain name whitelist management and login history viewing.
This system also has the function of obtaining WeChat access_token, which allows the current site to act as a central control server to uniformly obtain and refresh access_token.
The access_token used by other business logic sites is obtained by calling the current site.
This can avoid conflicts caused by respective refreshes, which will cause access_token to be overridden and affect services.