Can a security deposit be collected outside of the Airbnb website?
No. To make sure that guest payments are protected and that hosts are properly compensated for property damages, we require that all security deposits be handled through Airbnb. Payments outside of the Airbnb website, including security deposits, are a violation of our terms of service.
Host-required security deposits are not currently supported in mainland China – except for a small number of professional hosts and hotels. Hosts should not collect the deposit in cash or in other off-site ways according to our terms of service.