The system allows to process a chargeback for uncompleted or failed transactions. The system will reopen all the invoices that were associated with the selected payment and a negative transaction will be created with the same information of the original payment so the balance of both transactions is 0. If you want to charge your customers with a fee, you should consider processing aNSF instead of a Charge Back.
Instructions
Charging Back Credit Cards Payments
Once you charge back a payment made through a credit card, Komet Sales will refund automatically the transaction inClearent.