System for refunding purchase price to customer when goods are exchanged, transmits identifier to customer on data carrier and makes value of returned goods available via data network

摘要

The return of goods is detected by a first computer system (1). A second computer system (2) determines the value of the returned goods, and allocates it a unique transaction identifier. The second computer system transmits this identifier to the customer on a data carrier (10), and makes the identifier and value available to the customer via a data network (11).