bolt12 zaps: pay offers, NWC pay/receive, per-user offers, NIP-44

- sendLightning fetches an invoice from lno1 offers (payer_note passthrough
  for NIP-177 zap intents) and pays it through the existing bolt12 path
- NWC: new nwc#2 pay/receive methods (BIP-321 URIs, payer proofs stubbed
  until CLN 26.06 createproof), nip44_v2 alongside nip04 with per-request
  scheme detection, dual 23196/23197 notifications, 13194 refreshed when
  its content or encryption tag goes stale
- standing per-user bolt12 offer via GET /offer; incoming bolt12 payments
  record invreq_payer_note as memo
- parse/fetchinvoice routes handle offers; zap display parses kind 9736
  receipts (amount tag + embedded intent) and drops a call to a sync()
  helper that never existed

Co-Authored-By: Claude Fable 5 <[email protected]>

1 files changed, 23 insertions, 1 deletions

diff --git a/lib/payments.ts b/lib/payments.ts
index df2c8857..56aa08de 100644
--- a/lib/payments.ts
+++ b/lib/payments.ts
@@ -717,6 +717,7 @@ export const sendLightning = async ({
   amount,
   fee = undefined,
   memo = undefined,
+  payerNote = undefined,
 }) => {
   let p;
 
@@ -736,8 +737,29 @@ export const sendLightning = async ({
     }
   }
 
+  let decoded = await ln.decode(pr);
+
+  // A bolt12 offer (lno1...) isn't payable directly — fetch a real invoice
+  // from it over onion messages, then pay that. payerNote rides along in
+  // invreq_payer_note (NIP-177 bolt12 zaps put nostr:nip177:<intent-id> there).
+  if (decoded.type === "bolt12 offer") {
+    if (decoded.offer_currency)
+      fail("Currency-denominated offers are not supported");
+    if (!decoded.offer_amount_msat && !amount) fail("Amount required");
+
+    const { invoice } = await ln.fetchinvoice({
+      offer: pr,
+      amount_msat: decoded.offer_amount_msat ? undefined : amount * 1000,
+      payer_note: payerNote,
+      timeout: 60,
+    });
+
+    pr = invoice.replace(/\s/g, "").toLowerCase();
+    decoded = await ln.decode(pr);
+  }
+
   let { type, invoice_amount_msat, amount_msat, invoice_node_id, payee } =
-    await ln.decode(pr);
+    decoded;
   if (type.includes("bolt12")) {
     amount_msat = invoice_amount_msat;
     payee = invoice_node_id;