There's an issue where zaps to npub.cash addresses don't show on posts in Damus, although they show in some other clients. The same thing happens when Damus users zap Primal addresses. Not sure if it's the same issue, but nostr:npub1vp8fdcyejd4pqjyrjk9sgz68vuhq7pyvnzk8j0ehlljvwgp8n6eqsrnpsw added it to the open issue in GitHub yesterday.

npub.cash works very well. I now use it as my lightning address to receive zap from others. However, it is now not possible to zap each other's posts through the npub.cash wallet. Like Alby. Is it still necessary to integrate NIP-47? To be able to use my Npub.cash wallet to zap each other's posts. I want to integrate the wallet functionality of npub.cash into our Nostr client, Freerse. But we're new to Lightning network development.