Can I tell my customers whether breakfast is included in the hotel rate they are booking?

Yes, in most cases you can. Hotel booking APIs usually send a meal plan, sometimes called board basis, along with each room rate, and that information can be shown on the search results, on the room selection page and on the confirmation. So the same hotel may appear more than once in your results, once as room only and once with breakfast, and your customer picks the one they want.

The wording you get back is not always tidy. Some suppliers send a clear label such as room only, bed and breakfast, half board or all inclusive, while others send a short code or a line of free text inside the rate description. That usually means the labels have to be matched up so your website shows one consistent set of words to your customers instead of a different phrase from every supplier. Occasionally a supplier sends nothing useful at all, and then the safest thing is to display the rate description as it came and let the customer read it.

Be aware that what is actually served at the hotel is the hotel's decision, not something the system controls. Whether breakfast covers every guest in the room, whether children are included, and whether it applies to all nights of the stay can vary, and some of that detail only appears in the rate notes rather than in a field you can rely on. If it matters to the booking, it is worth confirming with the supplier rather than assuming.

The next thing to do is run a few test searches across your suppliers, see how the meal plan is coming through for each one, and check that the same line also appears on the voucher and the confirmation your customer receives.