nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z

Long press on the zap bolt will let you define an amount, as for the payment error if not wos fault, I find sometimes that clicking on the note itself to get it in single display instead of in the global feed helps amethyst to get the zap done.