Creates a topic with the given id and returns it */.

Deletes the specified topic and returns it */.

Returns all notifications to topics the user is subscribed to */.

Returns all public notifications */.

Returns all topics that notifications can be published to */.

Returns the notification order with the specified id */.

Returns all notifications for the specified topic */.

Publishes a notification to the specied topic and returns the notification */.

Registered the specified device token to the user */.

Subscribes a user to the specied topic and returns their updated subscriptions */.

Unsubscribes a user to the specied topic and returns their updated subscriptions */.