Do you have a written sale agreement? If you want to be able to enforce the agreement against the buyer, you'll need that. Even beyond enforcement issues though, a written sale agreement should make clear what the deal is. That way everyone knows what's expected. Make sure you include any issues around payment of the maintenance fees, next usage, and what usage gets transferred to the buyer. To name one known issue, if your ownership is Wyndham, it's not a given that the current use year's points transfer to the buyer, so the purchase agreement should specify what happens if they don't. What that looks like is up to you, but it should be spelled out so as to avoid a dispute down the road.