Credit card processing fees on Kinnek are charged to the supplier. We strive to keep our fees affordable. You pay a flat 2.5% fee when a customer pays you by credit card (and zero fee when they pay by wire transfer or ACH).
Currently, fees can’t be passed on to the customer through Kinnek. However, you are free to adjust your product price to compensate for the processing fee that you pay. In your invoice, you should make any such price adjustment clear to the customer.