When guests travel in groups, they can split the payment with each other. If they don’t pay the full amount within 4 days, we’ll cancel their reservation.How it works
The guest booking the reservation splits the cost with their group at checkout. Until it’s paid in full, their reservation will have an Awaiting group payment status and your calendar will be blocked for those dates.
Guests pay through their Airbnb accounts and can be added to the reservation, so you’ll know who’s coming to stay in your place before they arrive. Any guests on the reservation are Added guests and the payment status will be shown in Your Reservations.
If we cancel the reservation because they didn’t pay on time, we’ll give back any money they’ve paid so far. Since group payment reservations aren’t confirmed until everyone has paid, your cancellation policy won’t apply if we cancel the pending reservation.
https://www.airbnb.com/help/article/2034/what-s-group-payment