diff --git a/public/notification-service.js b/public/notification-service.js
index b89261a..acda637 100644
--- a/public/notification-service.js
+++ b/public/notification-service.js
@@ -1,4 +1,38 @@
-self.addEventListener("activate", async () => {
-  // This will be called only once when the service worker is activated.
+/// <reference lib="webworker" />
+
+/** @type {ServiceWorkerGlobalScope} */
+const service_worker = self;
+
+function urlB64ToUint8Array(base64String) {
+  const padding = "=".repeat((4 - (base64String.length % 4)) % 4);
+  const base64 = (base64String + padding).replace(/-/g, "+").replace(/_/g, "/");
+
+  const rawData = window.atob(base64);
+  const outputArray = new Uint8Array(rawData.length);
+  const outputData = outputArray.map((output, index) =>
+    rawData.charCodeAt(index),
+  );
+
+  return outputData;
+}
+
+service_worker.addEventListener("activate", async () => {
   console.log("Hello from service worker");
+  try {
+    /** @type {PushSubscriptionOptionsInit} */
+    const options = {
+      applicationServerKey:
+        "BCOsRaxpJeR0KyIPIg1rHx3pUtWVsGDGOxH65dDkqyU5ycF-CjPJxuqiXF4M0LpUMG_rk_YxSZX34uHbrV5umJQ",
+      userVisibleOnly: true,
+    };
+    console.log("Hello from service worker second time");
+
+    const subscription =
+      await service_worker.registration.pushManager.subscribe(options);
+
+    console.log("Subscription", subscription);
+    console.log(JSON.stringify(subscription));
+  } catch (err) {
+    console.log("Error", err);
+  }
 });
diff --git a/src/pages/Notification/notification-engine.ts b/src/pages/Notification/notification-engine.ts
index ed164cc..8f53a32 100644
--- a/src/pages/Notification/notification-engine.ts
+++ b/src/pages/Notification/notification-engine.ts
@@ -57,6 +57,7 @@ export class BgService {
   public static async unregisterServiceWorker() {
     const registrations = await BgService.bg.serviceWorker.getRegistrations();
     registrations.forEach((registration) => registration.unregister());
+    return registrations;
   }
 
   public static async getRegistration() {