The system described is an electronic payment and loyalty systems for retail and automatic unattended vending. In particular the invention relates to an electronic payment and loyalty system wherein the customer account information is cached in a nonvolatile memory on the payment terminal or point of...http://www.google.de/patents/US20030191709?utm_source=gb-gplus-sharePatent US20030191709 - Distributed payment and loyalty processing for retail and vending
