[fwlr]

I can’t speak to those spooky warnings of “only X left” from OTAs, I assume they’re technically true in some way but heavily massaged to increase anxiety because that improves conversion.

Orchestrating reservations is a lot more streamlined than you’re imagining. All sources have access to the reservation management system and can poll it for availability, while the booking is in progress it simply blocks out the booking with a “pending” booking. When the booking is made, the source adds it to the hotel’s system themselves. I have had customer support with both OTAs on the phone and heard them say “I can see you have this many rooms available…”. So if we have 7 rooms left, Expedia knows we have 7 rooms, Booking.com knows we have 7, and we know we have 7.

The only exception is if we have rooms with potential maintenance issues (air conditioners, TVs, and hot water systems have Heisenbugs too!), we will sometimes reserve one room of that type in case we need to move a guest. In that case, we would have 8 rooms available but Expedia and Booking.com would see 7.