Gsuite calendar sync with mysql via php

The project is to develop a module for sync Gsuite conference room calendar to local server mysql DB and modify the conference room calendar . it need support multi-conference room with per-configure . such as [login to view URL] Requirement below: 1) This project need to create by pure PHP , and programmer need to guide me how to apply the API and system configuration on gsuite. 2) For DB , you need to suggest the DB structure . 3) it can able to support sync with multi-Gsuite 4) UAT will tested on my server and my Gsuite 5) system no need to login Gsuite everytime and the conference room email account can be per-configure in system or DB. 6) Just need simple GUI for operation and Test .