diff --git a/vintasend/services/notification_backends/asyncio_base.py b/vintasend/services/notification_backends/asyncio_base.py
index 0502bc9..9ba4c92 100644
--- a/vintasend/services/notification_backends/asyncio_base.py
+++ b/vintasend/services/notification_backends/asyncio_base.py
@@ -1,10 +1,12 @@
-from abc import ABC, abstractmethod
 import asyncio
 import datetime
 import uuid
+from abc import ABC, abstractmethod
 from typing import TYPE_CHECKING, Iterable
+
 from vintasend.services.utils import get_class_path
 
+
 if TYPE_CHECKING:
     from vintasend.services.dataclasses import Notification, UpdateNotificationKwargs
 
@@ -58,6 +60,7 @@ async def persist_notification(
         send_after: datetime.datetime | None,
         subject_template: str,
         preheader_template: str,
+        metadata: dict | None = None,
         lock: asyncio.Lock | None = None
     ) -> "Notification":
         ...