Some credit cards, like flex spending cards, can only be processed through certain business types. Give us a call at 1-800-558-9558 to confirm that we have the correct business type code on file for you.
Contact your customer to confirm that there is enough balance on the card to cover the transaction.
Contact your customer to check whether or not their employer requires that you enter a commercial code while processing the transaction.
If none of the above solutions work, request a different form of payment or advise your customer to call the customer support phone number on the back of their card for more information.