An agent device is connected to a user device for browsing a merchant site, for selling products online and being served up on the Internet, the merchant site, and a server device of a credit-card company. In the case where an instruction of purchasing a product browsed by the user device is output,...http://www.google.com/patents/US20010021925?utm_source=gb-gplus-sharePatent US20010021925 - Account settlement method in online shopping
