Has anyone worked with the ISPManager API?

Question

PHP

Hello!
The project fell into my hands. It is essentially an add-on for the ISP manager. Those. the administrator puts ISP manager and places my script on the domain. The script is a simplified panel where you can simply create a server in 1 click, pay and receive its data. Also replenish the balance and support.
Does anyone have experience with interaction? Maybe there is a ready-made class?
Thank you!