diff --git a/lnurl.py b/lnurl.py
index 2588f8d..e4a6558 100644
--- a/lnurl.py
+++ b/lnurl.py
@@ -9,6 +9,7 @@ from .crud import get_myextension
 from lnbits.core.services import create_invoice
 from loguru import logger
 from uuid import UUID
+from typing import Optional
 
 #################################################
 ########### A very simple LNURLpay ##############