In EVE Online, there is a game object PLEX (Pilot License Extension).
PLEX allows two things:
1. Click the play to convert PLEX game time, which shall be credited to the Account from which the activation was.
2. Be offered for sale on Market in EVE.
The volume traded plexus goes daily to hundreds of thousands and currently is in the order price of around 500 million ISK. PLEX is also used to exchange for AUR, which is also a game ingame currency, which is used to play neovliňující game microtransactions (buying clothes etc.).
Browse to the relevant developer`s website and register an account. Follow the steps provided to activate the game or software using the key provided by KeenShop. These steps will vary depending on the developer in question and you will need to contact their support for any assistance in this regard.