VIUnsubscribe
typedef void
 VIUnsubscribe( subscriptionEvent)Signature for callbacks reporting that the current user has unsubscribed from other users changes.
Used in VIMessenger.
Triggered on all logged in clients of the current user as a result of VIMessenger.unsubscribe or VIMessenger.unsubscribeFromAll method calls.
Parameters
- subscriptionEvent:- VISubscriptionEvent object with subscription data and service information 
Returns
- type:- void