I developed an app using Firebase and Google Calendar, now i want substitute Google Calendar with Office365 Outlook Calendar.
The app is composed by a "phone app" made in Cordova that connects to a "server app" made in NodeJS. The "server app" uses a "Google Service Account" to add users to some calendars they don't own and grant them write permission. Using a service account was the only option to do this, due to its high privileges and the fact it doesn't require to open any login or authorize window.
I never used MS services and reading the docs it seems it's a mess because some services use a version of the API and some other use another one.
How can i authorize the "server app" in an equivalent way of the google's service account, so i can do the same thing? (add users to some calendars they don't own and grant them write permission).
Thanks.
