...which are also subject to sales tax in North Carolina, so you might want to check with the North Carolina Department of Revenue http://www.dor.state.nc.us/index.html for the specific items you sell....
(a) You made a typo in the card number, CCV code, expiration date, name or address;
(b) Your card balance is too low;
(c) Issuing bank has declined this transaction for some other reason related to your account.