API provides the price base on one room only, multiple rooms booking require the additional calculation by yourself.
The graph below is a sample of price breakdown, 10 elements are required on the booking form page and the confirmation letter. It is not necessary to list everything together, you can have your own design as long as the element is on the page even it requires mouseover or such.
The element No.1,2,3 can be the total amount of each OR the detailed nightly breakdown OR both. No.4 is not required if you don't charge additional fees. No.5 and (No.6 or 7) can be merged if you have a proper message. No.9 is for Hotel Collect inventory only.