Visual-Waves comes with a C++ programming interface to build your own indicators, systems or scanners. This SDK consists primarily of C++ headers and libraries that can be used to build the so called plugins. Plugins are Windows DLLs that can be loaded into the process and interact directly with the Visual-Waves application.
To make life easier, Visual Studio project-wizards can create the basic framework to start directly coding.
To write C++ plugins for Visual-Waves you will need Visual Studio 2019.
Really exciting is, that the free Community-Edition of Visual Studio will work to build plugins.