What certification / liense do I need?

My company wants to create an iOS for someone - and we will also provide the iOS devices on a short-term lease.


What is the proper distribution certificate/licensing required for this? I have been running around with Apple for a while and no one really seems to know.


It is definitely not an enterprise certificate, since the app will not be used within my company, and apparently the "Apple Business Manager" isn't appropriate since the customer is not purchasing their own devices. Any/ all help would be most appreciated.


Thanks!