If your credit card is declined there may be a few reasons why: the card has no funds available, you entered the wrong CSV security code, the card is expired, you entered the wrong billing information, or there is a hold on the card. You can call your issuing bank and ask them why the card is declined. Try a different credit card or try using PayPal as your checkout method, as they accept VISA, MasterCard, American Express and Diners Club.