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
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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.