Our API allows you to communicate with GSP-Panel using custom scripts. The entire panel was built on the same API that we have documented for your use. It allows you to develop a custom frontend or features without needing to spend the time replicating what we have already accomplished.
The API is constantly being developed and documentation is kept up to date with each release. If you need a feature that is missing open a ticket in the Members Area and we'll see what we can do.