Unsubscribe
Unsubscribes a recipient from an Information Service
            Unsubscribe (
            String       
            serviceName,
            XML          
            recipient
            
      )
         
      Parameters
serviceName
List of Information Service names (comma separated)
recipient
Recipient
Return value(s)
None.
Example
      var recipient = {recipient: {_key: "email", email: "john.smith@example.com"}}
nms.subscription.Unsubscribe("SVC1", recipient)
        
         Features
Schema: nms:subscription
Static:
Yes
