| 摘要 |
A machine enables the provision of a product or service, preferably in response to the insertion of coins, but in any event in response to the reading of credit data from a data carrying device which communicates in a contactless manner with a reader of the machine. The reader and data carrying device communicate while the device is located such that it can be removed by a user. The device may be positioned in a coin insertion slot or on a coin dispensing tray. The credit data in the device is not erased. Updating of the credit data is achieved by an instruction issued by the reader to the device, which causes the device to decrement the stored credit data. The provision of a product or service is enabled only in response to receipt of an acknowledgement from the data carrying device that such updating has taken place. |
