It's not us, we promise... All credit/debit cardholders are subject to validation and authorization checks by the card issuer. If the issuer of your payment card does not authorize payment for any reason, you will be notified immediately at the cash desk. A common reason for declined orders is entering the billing address incorrectly. Make sure that the address to which account statements are sent is entered in the "billing address" section. If there is a problem with your card, please contact your credit institution for further investigation.