A method permits a user to conduct a charged transaction utilizing a charge terminal of an electronic transaction system, the charge card terminal being configured to interface with a charge card for the purpose of conducting the charge card transaction. A merchant card is provided to a merchant where...http://www.google.de/patents/US7089214?utm_source=gb-gplus-sharePatent US7089214 - Method for utilizing a portable electronic authorization device to approve transactions between a user and an electronic transaction system
