PiXYZ PLUGIN for Unity (not PiXYZ PLUGIN for Unreal Engine) can be used in a final built application (at runtime) to load CAD models on-the-fly. A valid license needs to be installed on each computer running any application embedding PiXYZ PLUGIN for Unity. Please see respective documentation for more information.
Link to documentation : https://www.pixyz-software.com/documentations/html/2018.3/plugin4unity/ImportingatRuntime.html
Although, building an automatic batch tool or providing SaaS service to third parties based on PiXYZ PLUGIN or Unity is strictly forbidden, and is a violation of PiXYZ Software Product Terms & Conditions.