Do they show up as valid on clients that don't support cashu? If not, we may need a new zap spec (we need a new zap spec anyway)
They do. Minibits just register to pay for regular ln invoices in Android.
I don't know what that means, but awesome
Basically, the app registers a uri scheme (e.g. "lightning:") and that allows them to receive invoice payment intents from Amethyst. Then Minibits takes the Cashu token balance, converts it into Lightning, and pays it. So, as long as the Nostr client uses intents to call wallets, it should work.