Yes, you can pass 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. AffiniPay does not deduct processing fees per transaction, but debits the total fees once monthly from a designated account. You can pass this fees on to your clients by checking the ‘Client gets charged a processing fee’ option in Core > Global Settings > ePayments. Check the LawPay, CPACharge, and ClientPay (DesignPay) rates.