| 摘要 |
A method using an open communication network (10) to which retailer server stations (20) and customer stations (30) are connected. According to the method, a retailer server station generates a payment slip for the planned purchase transaction between the retailer and a customer, which slip comprises data on the retailer, the customer, the purchased item or service and the price; the payment slip is transmitted over the network to a payment server station (40); the payment server automatically checks whether the payment of said price is authorised for the customer in question, by querying the client's personal account set up in the payment server for paying small amounts, or, in the case of larger amounts, by making a query over a banking network (50) separate from the computer network (10); if the payment is authorised, the payment server generates a cash voucher comprising at least some of the data on the payment slip; and the cash voucher is transmitted to the retailer to enable the purchase to go ahead.
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