Booking.com reported an outage with their Reservations API.
The problem started at 2026-03-24 15:43 CET and was solved at 2026-03-25 17:30 CET.
If you have any issues with missed bookings, then please go to Settings > Channel Manager > Booking.com > Mapping and click 'Import existing bookings' button.
Alternatively contact Booking.com and ask them to assist you.