Hi vielktus,

In a case like your, some credentials information need to be passed to your Metadata Adapter.
If you wont use Lightstreamer authentication you should pass to the Metadata Adapter the user/session info generated by your authetication procedure.
In the notifyUser method you should validate that info against the Web/Application Server that generated it (or a database or whatever back-end system).

Once that the user is validated the notifyNewTables method of your Metadata Adapter should check if the user is entitle for all the Items requested and if not throw a CreditsException.