By default, Presence Services uses the Avaya Push Notification provider for Avaya clients, such as Avaya Workplace Client for iOS and Avaya Workplace Client for Android. If you are planning to use push notifications for third–party Avaya™ Client SDK-based iOS, Android, or both applications, you must use a third-party provider, for example, developed by the iOS or Android application developer. This provider must implement the following APIs: