How does iCal sync work between Airbnb, Vrbo, and Booking.com?

Each booking platform publishes an iCal URL containing reservations and blocked dates. Other platforms import that URL and refresh it periodically. Connect every channel in both directions, then verify test blocks on each calendar. Because iCal is not instant and carries limited booking data, operators who need near-real-time inventory updates should evaluate an API-based channel manager.