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Connect to Google Calendar in 4 steps
Go to console.cloud.google.com and create or select a project.
APIs & Services → Library → search Google Calendar API → Enable.
APIs & Services → Credentials → Create Credentials → OAuth 2.0 Client ID → Web application.
Add to Authorised JavaScript Origins:—
External type. Add your Gmail as a Test user. Scope: ../auth/calendar.
Paste the Client ID from step 3:
Sign in with the Google account that owns the calendar where bookings will be saved.