NIP-47 connects you to a remote wallet. NIP-60 (Cashu on Nostr) carries one with you. Together they cover every payment scenario on Nostr.
Most Nostr libraries give you the basics. nostr-core gives you the protocol.
No OAuth. No API keys. No vendor. Just the protocol.
You want to build on Nostr. You don't want to fight the protocol to get there.
Building on Nostr Shouldn't Feel Like Decoding a Protocol Spec