code: public void deleteRegisteredListeners(RESTRequest request, int clientID, ObjectName source_objName, JSONConverter converter) {
          //Get the client area
          ClientNotificationArea clientArea = getInboxIfAvailable(clientID, null);
  
          clientArea.removeAllListeners(request, source_objName, converter);
      }
docs: Delete all registered server-side notifications for the given object name.
  This can only be called from HTTP-direct clients