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.).
Register your own account at webpage of the game publisher. Registered account together with bought game key will help you to download the game from the publisher's webpage and play the game.