CalEvents Manager requires the following OAuth Scopes:

6 Scopes Requested

Run as a Calendar add-on

https://www.googleapis.com/auth/calendar.addons.execute

See, edit, share, and permanently delete all the calendars you can access using Google Calendar. (This is needed to perform the bulk actions on your calendar events)

https://www.googleapis.com/auth/calendar

View your country, language, and timezone

https://www.googleapis.com/auth/script.locale

See your primary Google Account email address

https://www.googleapis.com/auth/userinfo.email

See your personal info, including any personal info you've made publicly available

https://www.googleapis.com/auth/userinfo.profile

See, edit, create, and delete all your Google Sheets spreadsheets. (This is needed to access data on a specific Google Sheet related to your subscription status not created by the add on.)

https://www.googleapis.com/auth/spreadsheets