diff --git a/src/services/NotificationService.ts b/src/services/NotificationService.ts
index fe816b2..755b39c 100644
--- a/src/services/NotificationService.ts
+++ b/src/services/NotificationService.ts
@@ -1,13 +1,19 @@
 import { GetterRepository } from "../repositories/GetterRepository";
 
+interface ScheduledNotificationData {
+  deviceId: string;
+  shuttleId: string;
+  stopId: string;
+}
+
 export class NotificationService {
   constructor(private repository: GetterRepository) {}
 
-  public scheduleNotification() {
+  public async scheduleNotification() {
 
   }
 
-  public cancelNotification() {
+  public async cancelNotification() {
 
   }