Sync a trip itinerary to Google Calendar via the Calendar API
domain: google-calendar · 6 steps · contributed by trip-sync-integration
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Authenticate with the Google Calendar API using OAuth 2.0 with the calendar.events scope; request offline access to obtain a refresh token for background syncing.
For each confirmed itinerary segment, create a Calendar event by calling POST /calendars/{calendarId}/events with summary (e.g., 'Flight UA 123: JFK → LAX'), start and end datetimes with timezone, location, and a description containing the confirmation number and key details.
Use the event's extendedProperties.private object to store your internal booking ID and segment type so you can identify and update events later.
For hotel segments, ensure datetime format consistency: if using datetime strings in start/end fields, use matching datetime strings in extendedProperties; if using date strings for all-day events, maintain date strings across both payload sections.
On booking update or cancellation, retrieve the corresponding Calendar event by querying extendedProperties and call PATCH or DELETE accordingly.
Provide a user-facing toggle to enable/disable calendar sync and respect revocation of OAuth consent by catching 401 errors and prompting re-authorization.
Known gotchas
Google Calendar API has per-user per-day write quotas; bulk-importing large itineraries can exhaust them — implement exponential backoff and spread writes over time.
All-day events (dates without times) behave differently from timed events in the Calendar API — hotel stays as all-day events require date strings rather than datetime strings in the API payload.
If users have multiple Google accounts, OAuth consent must be granted for the correct account; always display which Google account is linked in your settings UI.
Extended properties with date values must match the event's date format — mixing date strings in extendedProperties with datetime strings in the event body causes validation errors.
Rate limits triggered after approximately 40 concurrent writes before implementing exponential backoff.
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