On nostr:npub15dc33fyg3cpd9r58vlqge2hh8dy6hkkrjxkhluv2xpyfreqkmsesesyv6e, we leave it up to the seller to delete the listing if it’s no longer active. You do this by clicking on your listing and then the delete button. Amethyst and Coracle support a status tag to indicate if a listing is active or sold; we’re going to be adding that on top of manual deletion, so as soon as a payment is made the status will be updated.