Connect a Wordpress hotel booking engine with a channel manager API XML -- 3

I have a wordpress website with a booking engine plugin that can only sync with iCal with the different OTAs (booking.com, airbnb...), and external I have a channel manager that works with Roomcloud that is already synced with the OTAs in XML.
I need my website to synchronize in XML with the channel manager (roomcloud) to update availability and prices of 5 apartments.
There is RoomCloud XML API integration documentation.