GanttProject support APIs?

H, Im lee.
I have a project that includes a service to display schedules, and I would like to integrate GanttProject into that service. I am wondering if it’s possible to do so by purchasing the GanttProject Cloud version. The project will be used for non-commercial purposes

I am not sure that I clearly understand the need. Can you please elaborate on what do you understand as “integration”? For the purposes of building chart images, you can just try running GP Desktop export from the command line.