Thanks!

Wallet is the client and has a node manager built in yes, the Nostr RPC comes from the lightning.pub repo, if you look at the methods there on GitHub you can see all the calls we make over Nostr... It's just like a regular http API, but we built a proto generator that takes the API and spits it out as Nostr interface code

We also recently PRd NIP69 to enable static payment codes over nostr without the full interface, debits coming next in a companion nip