For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download License Manager for Combu for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
License Manager for Combu
“If possible, please buy the package to support the developer”
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.