Syncing with Airbnb, Vrbo and Booking.com — Two links, pointing opposite ways

Airbnb, Vrbo and Booking.com all work the same way: each listing has a calendar link you can export, and a box where you can import somebody else's. There is no API a host with four cottages can reach — the pair of links is the integration. So there are two jobs, and they are separate. Paste their export link into RowFold and the nights it holds stop being sellable here. Give them RowFold's calendar link and the nights you have taken here stop being sellable there. Do only the first and your own booking page is safe while Airbnb keeps double-selling.