I know there is Slack integration but we do not use slack at all.

Our requirement is for us to be notified when a ticket reaches 15 minutes old without being assigned. Is there a way we can utilize the REST API in ServiceDesk to notify once something reaches that age?

I looked at Customer triggers and the trigger can only be executed when a request is created or edited which isn't very granular. 

My thought for Rocket Chat was to create a Powershell script to GET the request information and POST a JSON message back to Rocket Chat, but if there is an easier way to do this, please let me know.