To connect Booking.com to Preno's Channel Manager, please do the following:
Login to your Booking.com extranet.
Click on this icon in the top right corner
Select 'Connectivity Provider'
Click on 'Search' or 'Switch providers'
Search for Preno and authorise.
Tick ‘Extranet access’ checkbox
Click on "Review connections”
Click on “Confirm connections"
Message Preno through the in app chat to confirm Booking.com has now been connected to Preno.
Booking.com Help Centre: Setting up and working with a connectivity provider