There are many reasons why a charge might be declined. Double check that your credit card number, expiration date, and billing address were entered correctly. If the card being used is not yours, we recommend you contact the card owner to verify you have the correct information.
If the charge is still being declined, we recommend you contact your bank to make sure there is not a hold on your card. Your bank may have put a hold on your card for fraudulent activity or insufficient funds.