Gmail oauth 2. receiving access and refresh tokens for my accounts

The current project is written in php and spins in ubuntu as a webserver, you will need to integrate this part.
There are step-by-step instructions for gmail how to do this.
Further support for the project is very welcome.

heres a link with a manual on YouTube that couldnt be done.
https://www.youtube.com/watch?v=IV3PN7IejTg