No the app doesn't know which note was used, or when the payment is received, this would require either access to private keys to generate new sub-addresses per note created, or using a primary address starting by 4 and adding a payment id on top of it creating an integrated address, last one is prob easy to add but then no way to notify without scanning with view keys, still thinking through a proper zap event but today it's just tipping from wallet to wallet and skips nostr