METHOD, DEVICE, AND SYSTEM FOR PROVIDING RANDOM ADDITIONAL POST-PAYMENT DISCOUNT FOR ELECTRONIC COMMERCIAL TRANSACTION IN OPEN MARKET

摘要

The present invention relates to a method, a device, and a system for randomly providing an additional post-payment discount for an electronic commercial transaction in an open market and particularly to a method, a device, and a system for providing a random additional post-payment discount of 1% to 100% based on an amount paid by a buyer, following the payment made when the buyer has selected and purchased one or more products in an open market which provides a plurality of unspecified sellers with a virtual sales space online.