Electronic data interchange system, sales server, settlement server, terminal, sales method, settlement method, purchasing method and information recording medium storing information for realizing the same

摘要

A terminal receives input data regarding a desired product, and sends a message including information regarding the product to a sales server. The sales server receives this message, acquires the price of the product, and sends a message including the price and a settlement server to the terminal. The terminal receives this message, accepts input data of a scratch number of a prepaid card, and sends a message including the scratch number, the price and the sales server to the settlement server. The settlement server receives this message, acquires the balance corresponding to the scratch number. If the balance is not less than the price, the settlement server updates the balance by subtracting the price from the balance, and sends a message that the settlement has been succeeded to the sales server. The sales server receives this message and provides the desired product.