Our payments are processed via "2checkout.com".
If your credit card is being rejected try the following:
1: Clear your cookies.
2: Call 2 checkout.com (1-877-294-0273), and talk to them, tell them your problem, they should be able to help.
3: The problem MAY be with your credit card company rejecting the sale, if the above two options don't work, try calling your card company and authorize the sale.