diff --git a/appinfo/info.xml b/appinfo/info.xml
index a7061dc..d4958bf 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -6,7 +6,7 @@
 	<summary>Receive a notification when an event in a shared calendar was added, modified or deleted.</summary>
 	<description><![CDATA[Receive a notification when an event in a shared calendar was added, modified or deleted.]]></description>
 
-	<version>0.3.4</version>
+	<version>1.0.0</version>
 	<licence>agpl</licence>
 	<author>Joas Schilling</author>
 
@@ -27,6 +27,6 @@
 	<screenshot>https://github.com/nickv-nextcloud/event_update_notification/raw/master/docs/demo.png</screenshot>
 
 	<dependencies>
-		<nextcloud min-version="14" max-version="16" />
+		<nextcloud min-version="17" max-version="17" />
 	</dependencies>
 </info>
diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 23b6e83..f277521 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -63,14 +63,6 @@ public function registerEventListener() {
 	}
 
 	protected function registerNotifier() {
-		$this->getContainer()->getServer()->getNotificationManager()->registerNotifier(function() {
-			return $this->getContainer()->query(Notifier::class);
-		}, function() {
-			$l = $this->getContainer()->getServer()->getL10NFactory()->get('event_update_notification');
-			return [
-				'id' => 'event_update_notification',
-				'name' => $l->t('Calendar event update notifications'),
-			];
-		});
+		$this->getContainer()->getServer()->getNotificationManager()->registerNotifierService(Notifier::class);
 	}
 }
diff --git a/lib/Backend.php b/lib/Backend.php
index 2de1cdd..77528ae 100644
--- a/lib/Backend.php
+++ b/lib/Backend.php
@@ -83,7 +83,7 @@ public function onTouchCalendarObject(string $action, array $calendarData, array
 		}
 
 		$classification = $objectData['classification'] ?? CalDavBackend::CLASSIFICATION_PUBLIC;
-		$action = $action . '_' . $object['type'];
+		$action .= '_' . $object['type'];
 		list ($dateTime, $hasTime) = $this->getNearestDateTime($objectData['calendardata']);
 		$now = new \DateTime();
 
@@ -94,7 +94,7 @@ public function onTouchCalendarObject(string $action, array $calendarData, array
 
 		$notification = $this->notificationManager->createNotification();
 		$notification->setApp('event_update_notification')
-			->setObject('calendar', (int) $calendarData['id'])
+			->setObject('calendar', (string) $calendarData['id'])
 			->setUser($currentUser)
 			->setDateTime($now)
 			->setMessage('event_update_notification', [
diff --git a/lib/Notifier.php b/lib/Notifier.php
index 8dcb492..205d1af 100644
--- a/lib/Notifier.php
+++ b/lib/Notifier.php
@@ -32,6 +32,7 @@
 use OCP\IUser;
 use OCP\IUserManager;
 use OCP\L10N\IFactory;
+use OCP\Notification\AlreadyProcessedException;
 use OCP\Notification\IManager as INotificationManager;
 use OCP\Notification\INotification;
 use OCP\Notification\INotifier;
@@ -74,6 +75,26 @@ public function __construct(IFactory $languageFactory,
 		$this->dateTimeFormatter = $dateTimeFormatter;
 	}
 
+	/**
+	 * Identifier of the notifier, only use [a-z0-9_]
+	 *
+	 * @return string
+	 * @since 17.0.0
+	 */
+	public function getID(): string {
+		return 'event_update_notification';
+	}
+
+	/**
+	 * Human readable name describing the notifier
+	 *
+	 * @return string
+	 * @since 17.0.0
+	 */
+	public function getName(): string {
+		return $this->languageFactory->get('event_update_notification')->t('Calendar event update notifications');
+	}
+
 	/**
 	 * @param INotification $notification
 	 * @param string $languageCode The code of the language that should be used to prepare the notification
@@ -81,7 +102,7 @@ public function __construct(IFactory $languageFactory,
 	 * @throws \InvalidArgumentException When the notification was not prepared by a notifier
 	 * @since 9.0.0
 	 */
-	public function prepare(INotification $notification, $languageCode): INotification {
+	public function prepare(INotification $notification, string $languageCode): INotification {
 		if ($notification->getApp() !== 'event_update_notification') {
 			throw new \InvalidArgumentException('Invalid app');
 		}
@@ -97,16 +118,14 @@ public function prepare(INotification $notification, $languageCode): INotificati
 		} else if ($notification->getSubject() === self::SUBJECT_OBJECT_UPDATE . '_event') {
 			$subject = $this->l->t('{actor} updated {event} in {calendar}');
 		} else {
-			$this->notificationManager->markProcessed($notification);
-			throw new \InvalidArgumentException('Invalid subject');
+			throw new AlreadyProcessedException();
 		}
 
 		$params = $notification->getMessageParameters();
 		$start = \DateTime::createFromFormat(\DateTime::ATOM, $params['start']);
 
 		if ($start < $this->timeFactory->getDateTime()) {
-			$this->notificationManager->markProcessed($notification);
-			throw new \InvalidArgumentException('Past event');
+			throw new AlreadyProcessedException();
 		}
 
 		if (!empty($params['hasTime'])) {