Is LumaFusion a subscription purchase?
LumaFusion is a one-time purchase from the App Store. You will continue to receive updates of LumaFusion with free new features and bug fixes.
LumaFusion does offer some In-App purchases:
Storyblocks for LumaFusion: this is a subscription based royalty free media asset library
Frame.io integration for users of that video collaboration platform
FCPXML export for users who want to start editing on LumaFusion then transfer their project to Final Cut Pro to finish