Your search for flights and hotels - who to work with?

Question

API

We are thinking about implementing a search on our side through the xml api from suppliers, trying to select suppliers ... but so far everything is somewhat opaque.
In the end, we want the search and booking on our website to take place completely, i.e. not like in metasearch engines, when you found the price, you go to your competitors to book and pay. Accordingly, providers like skyscanner will not work.
Who works with whom and like it or not?