The register method is used to ask the system to request a new endpoint for notifications. This method has been superceded by PushManager.subscribe().
The registrations method is used to ask the system about existing push endpoint registrations.
The unregister() method was used to ask the system to unregister and delete the specified endpoint. In the updated API, a subscription is can be unregistered via the PushSubscription.unsubscribe() method.
The PushSubscription interface of the Push API provides a subcription's URL endpoint and allows unsubscription from a push service.
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The endpoint read-only property of the PushSubscription interface returns a DOMString containing the subscription ID associated with the push subscription.