There are many reasons why a credit card would be declined. The most common issue is your billing address. Your billing address must match the address that is assigned to your credit card. So if your credit card company sends your statement to your PO Box, then your PO Box is what you must post in our billing address field. If you have a problem with your credit card, please contact us on the phone. We would be happy to assist you with ordering. 253.677.4384.