From 41a6e083b168e8cdb48a51a14cb1559c40fe8f55 Mon Sep 17 00:00:00 2001
From: thesimplekid <tsk@thesimplekid.com>
Date: Tue, 24 Sep 2024 13:29:27 +0200
Subject: [PATCH] feat: check for change in payment lookup id

---
 crates/cdk-axum/src/router_handlers.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/crates/cdk-axum/src/router_handlers.rs b/crates/cdk-axum/src/router_handlers.rs
index d65c67dca..a935add4c 100644
--- a/crates/cdk-axum/src/router_handlers.rs
+++ b/crates/cdk-axum/src/router_handlers.rs
@@ -321,6 +321,23 @@ pub async fn post_melt_bolt11(
             // Since it will not fail and even if it does the ln payment has already been paid, proofs should still be burned
             let amount_spent = to_unit(pre.total_spent, &pre.unit, &quote.unit).unwrap_or_default();
 
+            let payment_lookup_id = pre.payment_lookup_id;
+
+            if payment_lookup_id != quote.request_lookup_id {
+                tracing::info!(
+                    "Payment lookup id changed post payment from {} to {}",
+                    quote.request_lookup_id,
+                    payment_lookup_id
+                );
+
+                let mut melt_quote = quote;
+                melt_quote.request_lookup_id = payment_lookup_id;
+
+                if let Err(err) = state.mint.localstore.add_melt_quote(melt_quote).await {
+                    tracing::warn!("Could not update payment lookup id: {}", err);
+                }
+            }
+
             (pre.payment_preimage, amount_spent)
         }
     };