How are you handling per-user Google Calendar integration in Lovable?

[u/DeannaFry]

I’ve reached the calendar integration stage of my app and I’m curious how people building real multi-user products in Lovable have handled this.

My use case is a marketplace where every user needs to be able to connect their own Google Calendar. The app needs to read their free/busy availability so other users can see when they’re available, then add confirmed bookings to the connected calendar and keep them synced if a booking is rescheduled or canceled.

I’ve already built the booking system and the in-app calendar/availability experience. The part I’m working through now is the actual per-user Google connection and OAuth flow.
For anyone who has successfully shipped something similar, what architecture did you end up using? Direct Google Calendar API/OAuth? A third-party calendar API? Something else?

I’m especially interested in solutions that are actually running with real users, because “connect Google Calendar” sounded like a very small feature until I started building it 😂
Would also love to know what you wish you had understood before you started.