The mathematical check (mod10/luhn) on the account number has failed. Possible typo.
The credit card number was typed incorrectly. Verify the credit card number with card holder.
UNSUPPORTED CARD TYPE
Your Merchant Account doesn't support the card type you are trying to process. Contact your processor to add the card type.
AMEX NOT ALLOWED
Your Merchant Account does not support American Express. Contact your Merchant Account Provider to have American Express added.
AUTH DECLINED 200
Issuing bank of credit card has declined the transaction. To find out exactly why, have the card holder contact their issuing bank.
