For example, a test version of cpanel. So that any features built on top of those APIs can be tested without having to use production data.
Reach out to Neto about their partner program. I'm pretty sure Neto partners get a test account.
The best way would be to sign up to a demo store, they will give you a free trail and a store you can play around with. That's what we do when we need to train staff.
