Google Calendar OAuth2 Creds Saver

I need a page/code that generates Google Calendar OAuth2 creds for some of my users in the site (wordpress). The page doesn't have to look good. it just has to work. your The output creds should be saved in a file and be enough to create a calendar read+write service from it. i need it done as soon as possible so only apply if you know what you are doing please. ----------------------------- DETAILS ----------------------- prelude: the site ([login to view URL]) currently syncs lessons to google calendars of the mentors. to do this - each mentor has to grant access to gameready to use his calendar. problem: the access granting currently is done manually via CLI tool: [login to view URL] and only worked for my calendar using google developer console (which is not the way to go for typical users) what needs to be done: the access granting has to be done on [login to view URL] , using conventional ways, without google developer console and [login to view URL] . it doesn't have to be fancy, nor convenient, nor specific. it just has to work. in other words it has to produce file/s that can be used for calendar manipulation scripts (that are already working).