The WUPI (WIBU Universal Protection Interface) functionality can be called by including the WupiEngine.
The WupiEngine is inegrated vias a using command:
using wupiengine;
In the project file, it is referenced as follows under Windows, for example
ItemGroup>
<Reference Include="WupiEngine">
<HintPath>C:\\Program Files (x86)\\WIBU-SYSTEMS\\AxProtector\\Devkit\\bin\\dotnet\\cps_wupiengine.dll</HintPath>
</Reference>
</ItemGroup>