Systems and methods using a data structure summarizing item information in authorization request messages for communication in transactions involving multiple items

摘要

A system and method includes an authorization request message configured with information about transaction amounts of items aggregated according to item categories and applicable rates for the items in the respective categories. Based on the information provided in the authorization request, a transaction handler is configured to compute a modified transaction amount for the transaction by reducing the transaction amount of items in one or more of the categories, without reducing the transaction amount(s) of items in one or more other categories, and computing a total transaction amount based on the reduction and the applicable rates.