Connect your property with partners through Icalendar link
Step 1 , click "copy" of BookandLink Ical and paste to partner
Step 2 , paste partner Ical to Icalendar Links
Step 3, waiting system to PULL all the calendar data from partner
notes : BookandLink will PULL the calendar of partner each 5 minutes , for partner PULL the BookandLink Ical it's depend on partner system you may ask directly to partner