Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download License Manager for Combu Free.
License Manager for Combu
This package requires Combu (min. version 2.1), that you must own prior to use this asset or purchase before on Asset Store.
If you need a license manager for your awesome game/app, to manage licenses as monthly/yearly subscriptions or timed/launches expiration trials then this asset is what you’re looking for!
It is not meant to replace or work as a full featured DRM manager, but it will fit your needs if your game/app requires online access (as it is most likely, if you are using Combu) with a subscription plan.