Can I see which hotel rooms are already booked through the API so I don't offer them to my customers?

Yes, you can see real-time room availability through the hotel booking API, which tells you which specific room types are sold out at a property on any given date. When you search for a hotel, the API returns the rooms that are still available for booking, so you only show your customers options that actually exist. This means you won't accidentally try to book a room that is no longer there, which would create problems for you and your customer.

The availability information updates constantly as other travel agents and customers book rooms, so what was available an hour ago might be gone now. The API reflects these changes in real time, but you should know that between the moment you show a customer a room and the moment they actually book it, someone else could grab it. Most suppliers give you a short window to complete the booking before the room becomes unavailable again.

How quickly the availability updates depends on the hotel supplier and their system, so there can sometimes be a slight delay before the API shows that a room has been booked by someone else. If a customer tries to book a room that has just sold out, the booking will fail and you will need to offer them a different option. Check with your supplier or your account manager about their specific availability update process so you understand how fresh the information is when you are showing it to your customers.