stump on Nostr: It's a lightning invoice receipt. But in basic form, it's allowing users to easily ...

It's a lightning invoice receipt. But in basic form, it's allowing users to easily send sats via clients which helps perpetuate a value for value system. If you set up a wallet supporting zaps (NIP57) on your nostr profile you can start utilizing them. WoS supports it, as well as Zebedee now (as well as a couple others I believe).