Callback for a Provider when the DOFOperation, representing the act of Providing, has timed out or is cancelled. Because the callbacks are notified as requests are made and completed, subscriptions, registrations, and sessions created by Subscribe, Register, and Session will not be removed by SubscribeComplete, RegisterComplete, and SessionComplete, respectively, after this (Complete) is called. It may therefore be necessary to cleanup data "orphaned" by the completion of the provider (since the callbacks will not be called again for this operation). This callback may be NULL to ignore the completion of the Provide.
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