Creates a new calendar configuration with Google Calendar integration
All API endpoints are authenticated using API Keys. The key should be included in the 'Authorization' header, prefixed with 'Token '. Example: 'Authorization: Token YOUR_API_KEY'.
Calendar created successfully.
Unique calendar identifier for the user
Calendar platform (always "google_calendar")
User's Google account email
Success message
User's display name
List of calendars from the user's Google account
ID of the primary calendar