We used the “Additional Charge” feature, but on the checkout page, next to the security deposit it says (refundable). The security deposit is not actually included in the amount they pay upfront, so it is technically not “refundable.” Many guests contact us to ask when they will receive a refund of their security deposit and we have to explain to them that it was never paid, but is just an additional charge option we have after checkout if needed. Guests are often disappointed to realize this, thinking they were going to get $500 back of what they had already paid.