Booking.com - Booking.com requires Instant Booking for all listings in all scenarios, whether they are managed by software like MyVR or not.
Airbnb - Instant booking is enabled by default, but can be turned off per listing or across an entire Airbnb account. Learn more here.
FlipKey/TripAdvisor - Instant booking is not required by Flipkey, but it can be enabled if users have a Pay-Per-Booking type subscription and request it from their FlipKey/TripAdvisor account manager.
Vrbo - Instant booking is not required but it can be enabled if users turn it on within their booking policy settings in MyVR. Learn more here.