Hi Hannah,
I'm guessing this is about integrating with a Student Information Management System, like OpenSIS or similar? That's what I gathered from this page, at least: https://www.webanywhere.co.uk/education/moodle-sims-integration.
In any case, this sounds like something a Moodle partner could be of assistance in, as this sounds like quite a complex integration. Since you're still running 2.9 (no active support or security fixes), I'd also recommend you consider upgrading your Moodle to a more recent version > Moodle 3.1.
Also, start by putting on paper use cases or stories on how you'd want the data to be exchanged between your SIMs and Moodle. This will provide with a starting point for the decision.