Mmm … any pointers nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z? (Stall is for nostr:npub1enuxqa5g0cggf849yqzd53nu0x28w69sk6xzpx2q4ej75r8tuz2sh9l3eu ). On closer inspection I see NIP-15 listed under supported features on https://github.com/vitorpamplona/amethyst but not ticked.
Discussion
Looking at the code I _think_ it’s just NIP-99 support. Related issue so products (classified ads) are listed on nPub profiles would be good. See: https://github.com/vitorpamplona/amethyst/issues/995