How to get Google Calendar API data to sync with RedMine?

Question

Google

To synchronize Google Calendar with RedMine, we use the Redmine GC sync plugin .
It requires making data:
Google Client ID - everything is clear here, we get it in the Google Developers Console.
Google Client Secret - we get it in the same place, in the Google Developers Console.
Google Calendar ID Global Delivery - we take in the settings of the desired Google Calendar.
And with this, questions arose:
Google Calendar ID Issue Delivery - it's not clear where to get it, and in general, it's not clear what it is.
Google Calendar ID Issues - it's not clear where to get it, and in general, it's not clear what it is.
refresh token - also did not quite understand how to get it.
Can you tell me where to get the missing data? Has anyone used this solution?

Answer 1

Actually the issue is resolved , everything must be done sequentially)