JAMF / APM Integration - Exchange Device ID lookups via API

I'm needing to integrate with JAMF Pro for device lookups via the API. I've seen the iApp for MobileIron and suppose I could possibly use it and make the necessary changes but, thought I'd reachout to the community to seek advise first.

I'd like to be able to query the JAMF API and do a lookup for the clients Exchange ID and allow/deny the connection based on the lookup results. I'm assuming an iRule will be needed but I haven't found any iRule references that make api calls. Has anyone sucessfully implemented an iRule that makes an external api call for lookups?