I see the debug you inserted. When I disable the USPS integration, my credit card goes through fine. But when I enable the API, I get the error below when I checkout buying a Nike Dri FIT Golf Shirt for$53.00 Size: Men - Small Color: : White is as follows:
Your transaction could not be completed. Either your credit card information or billing address has problems and cannot be processed
Please return to checkout and try again.