A chargeback settlement processing (CSP) computer system for determining a gain or loss in a chargeback transaction is provided, that includes a memory device and a processor in communication with the memory device. The processor is programmed to transmit to a payment card network for settlement at least one chargeback transaction file corresponding to at least one received chargeback transaction, associated with an original transaction settled using a first currency exchange rate. The at least one chargeback transaction file includes a unique file identifier. A reconciliation message received from the payment card network includes at least one settlement amount, determined at a second currency exchange rate, for the at least one chargeback transaction and the unique file identifier. The at least one chargeback transaction file is matched to the at least one settlement amount, using the unique file identifier, to determine whether a net gain or a net loss occurred.