diff --git a/lamassu-next/apps/machine/src/services/lightning.ts b/lamassu-next/apps/machine/src/services/lightning.ts
index 1602372..f522bba 100644
--- a/lamassu-next/apps/machine/src/services/lightning.ts
+++ b/lamassu-next/apps/machine/src/services/lightning.ts
@@ -791,8 +791,11 @@ function createATMServices(
   lightningPub: LightningPubClient,
   clink: CLINKClient,
   _identity: MachineIdentity,
-  _onPaymentSuccess: (preimage: string) => void
+  onPaymentSuccess: (preimage: string) => void
 ): ATMServices {
+  // Store callback for LNURL-withdraw polling to use
+  const onPaymentCallback = onPaymentSuccess
+
   return {
     /**
      * Generate an ndebit URI for cash-in