All credit card information is not stored on Akasha servers.
Our payment processor Stripe handle storage and protection of all credit card information. Check the link for more information on their security standards and systems.
All stored information is protected and encrypted.
Your credit card information will never be stored unless you've selected the option to do so upon checkout.
If you stored your information accidentally, or you would like to change your credit cared information you can do so by logging in, and proceeding to "My Account" through the main menu.
In "My Account" you'll be able to modify or remove any stored credit card information.