Yes, you can charge credit card processing fees to your clients. CORE has the capability to include those fees in the invoice payment total when your client clicks the Pay Now button. BQE ePayments does not deduct processing fees per transaction, but debits the total fees once monthly from a designated account. You can charge this fee on to your clients by checking the ‘Client gets charged a processing fee’ option in Settings > ePayments. Check ePayments for details.