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.