From ebff2e92e4ab29facac5f27f0aebfbdddbe098ec Mon Sep 17 00:00:00 2001
From: Spencer Rhodes <79768179+libertas-primordium@users.noreply.github.com>
Date: Fri, 29 May 2026 15:22:17 -0600
Subject: [PATCH] Use backend invoice payment hash for settlement checks

Store the payment hash returned by the Lightning backend when creating a pending LNURL purchase session instead of always storing the locally generated preimage hash.

This fixes phoenixd-backed payment reconciliation because phoenixd creates invoices with its own payment hash while Europa previously stored the generated preimage hash and then polled phoenixd for a hash it did not recognize.

Validated with pnpm install --frozen-lockfile, pnpm build, and pnpm test. Also validated on a live phoenixd-backed Europa node: after this change, a 100 sat Lightning purchase increased phoenixd balance, the session changed from pending to active automatically, and the WireGuard peer was added without manual database or wg intervention.
---
 src/routes/lnurl.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/routes/lnurl.ts b/src/routes/lnurl.ts
index 0f16a30..ed405a1 100644
--- a/src/routes/lnurl.ts
+++ b/src/routes/lnurl.ts
@@ -191,7 +191,10 @@ export function registerLnurlRoutes(app: FastifyInstance, deps: LnurlRouteDeps):
       status: 'pending',
       last_rx_counter: 0,
       last_tx_counter: 0,
-      payment_hash: paymentHash,
+      // Store the payment hash from the backend-created invoice.
+      // Phoenixd returns its own invoice payment hash; settlement polling
+      // must check the hash for the actual payable invoice.
+      payment_hash: invoice.paymentHash || paymentHash,
       listing_d_tag: deps.config.listing.d_tag,
     });