Collaborative System and Method of Computers to Establish a Set of Parameters to Control Message Communications during an Authorization Phase

A user interface in a collaborative computer system having, connected via computer networks: an Inventory Management System (IMS) having a database of items; a centralized platform; a transaction handler; computers controlling accounts; and a terminal. Upon activation of an element of the user interface on the terminal, the terminal identifies an item from the database and generates a collaborative request regarding the item to a web service of the centralized platform, which causes the centralized platform to control, according to a workflow, a sequence of message transmissions in the collaborative computer system to determine a set of negotiated parameters. During an authorization phase of a transaction on the terminal involving the item and an account, the transaction handler communicates with the centralized platform to add a qualification status of the account, determined according to the negotiated parameters, in a field of a transaction message that is addressed to the terminal.