Obtain user's assigned assets via API

We are looking to automate some of our off-boarding processes and one of the unknowns is the employee's assets. Some of our employee base has a laptop + ipad and we want to make sure it is all recovered at termination. We have multiple locations and sometimes a manager will terminate an employee and collect their gear so ideally we'd like to make sure they know what should be collected.

Our assets are up to date in ManageEngine, I see there is an API interface but my research is showing a way to get assigned assets. Are their any ideas on how to obtain this data? Mostly we are working in PowerShell for our scripting.

Thanks!
Jake