Sure, if the customer is okay with that. I've had clients that would prefer to pay 3% to be able to use their credit card to pay an invoice, rather than go thr

Sure, if the customer is okay with that. I've had clients that would prefer to pay 3% to be able to use their credit card to pay an invoice, rather than go through a wire transfer process. You can just add the fee onto the charge, and let the customer decide if the convenience of paying with a card is worth it.