| 摘要 |
A retail unit facilitating a purchase of a customer having an electronic wallet (9) which includes an electronic checkbook (320) and an electronic purse (310). The retail unit includes a POS (10) which determines the purchase price, and a payment unit (8) for receiving payment from electronic wallet (9). Payment unit (8), upon receipt of an electronic wallet (9) and of a purchase price from POS (10), determines automatically whether to: (a) receive via electronic checkbook (320) a purchase price .gtoreq. a predetermined minimal checkbook payment sum; or, (b) receive the purchase price from electronic purse (310); or, (c) first replenish the electronic purse (310) via electronic checkbook (320) with at least the larger of a predetermined minimal purse replenishment sum and the difference between the purchase price and the electronic purse's stored value, and then receive the purchase price from electronic purse (310).
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