The new nostr:npub1xnf02f60r9v0e5kty33a404dm79zr7z2eepyrk5gsq3m7pwvsz2sazlpr5 app vibrates two times after a zap.

I think of them as Zap Sent-> Zap Received.

Not really sure if that’s what happening. But I like to believe so, it’s a nice confirmation.