Most things which can be purchased in-game require Credits.
How To Earn CreditsCredits are primarily acquired by attacking players and NPCs; when you win an attack, you steal a portion of their unbanked Credits. You can also win Credits via raiding, lottery wins, your Income Per Hour attribute, completing Objectives and Quests, and much more!
Banking To Protect CreditsIt is possible to deposit your Credits into the bank. Once banked, they are significantly less vulnerable to theft by
other players and guilds. For more information, please visit the banking article.