Yes, the hotel booking API lets you see the different room types that are available at a property for your customer's dates. When you search for a hotel, the results will show you options like standard rooms, deluxe rooms, suites and other variations that the hotel offers, along with the price for each one. This means you can browse what is on offer and show your customer the choices before they decide to book.
The room information you get back from the API depends on what the hotel supplies to us. Some properties give us detailed descriptions, photos and amenities for each room type, while others provide more basic information. You will see what is available for the specific dates your customer wants to travel, so availability can change if they shift their trip by a day or two. This is useful because you can help your customer pick the right room for their needs and budget without having to call the hotel or check another website.
Keep in mind that room types, prices and what is actually in stock can all shift as the hotel updates their system, so what you see in the API might change between the moment you search and the moment your customer books. This is normal for hotel booking and happens across the whole industry. To make sure you are giving your customer the most current information, run your search close to when they are ready to commit to a booking.