Cloud Service Authentication
The Push Notification protocol enables a cloud service to send a notification to a phone application using a RESTful API. The cloud service can choose to operate as authenticated or unauthenticated by registering an X.509 certificate with the MPNS. An unauthenticated cloud service is limited to sending 500 notification requests a day for each subscription. Although in most cases this will suffice, having an authenticated cloud service removes this limitation, and an unlimited number of push notifications can be sent for the life of a subscription.
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