If a webservice tries to send a push notification to a device that has not registered for push notifications for the entitlement requesting the notification to

If a webservice tries to send a push notification to a device that has not registered for push notifications for the entitlement requesting the notification to be sent, the notification gets discarded. Remember, all notifications are to be pushed to Apple using a certificate generated on a per-app basis, who in turn pushes the message to devices.