Map every direction
Export Airbnb to Vrbo and the central calendar, export Vrbo to Airbnb and the central calendar, and repeat for each source. Test a temporary block and confirm it appears everywhere.
Monitor feed health
Record the last successful fetch, surface stale feeds, and alert the responsible person. A configured URL is not proof that synchronization remains healthy.
Use stronger connectivity when risk demands it
High-volume or same-day booking operations may need a channel manager or direct integration. iCal is a useful availability layer, not a guarantee of instant inventory control.