Subscribe
Create or update a recipient subscription to an Information Service
            Subscribe (
            String       
            serviceName,
            XML          
            recipient,
            Boolean      
            create
            
      )
         
      Parameters
serviceName
List of Information Service names (comma separated)
recipient
Recipient to register and optionally to create
create
Create recipient if it does not exist
Return value(s)
None.
Example
      var recipient = {recipient: {_key: "email", email: "john.smith@example.com"}}
nms.subscription.Subscribe("SVC1", recipient, false)
        
         Features
Schema: nms:subscription
Static:
Yes
