Attached you can find the Commercial & Technical guidelines for the usage of the Booking.com Affiliate Partner Program API/XML.
Please note that these guidelines provide an introductory overview. You will be able to obtain more information about the API/XML if your access request is granted.
After going through the guidelines, you can request access. To read how to request API access, please visit here.
IMPORTANT: A strict and mandatory requirement for us to consider granting API access is an already steady performance of over 500 stayed bookings per month.
Until your Affiliate Partner account reaches that level, the widgets and links (which open up to mobile optimized pages) offered in the Partner Center can be used to gauge your user's intent and the results that come from it.