Abstract: A system and corresponding method for electronic presentment of bills and invoices related to goods and/or services provided by a first entity to a second entity includes a first mechanism for authenticating at least one first-entity-class user, and a second mechanism for authenticating at least one second-entity-class user. An application server includes a first application component that interacts in real-time over a network with an authenticated first-entity-class user to enter, create, maintain, and store billing information and related invoices pertaining to at least one second entity. A second application component interacts in real-time over the network with an authenticated second-entity-class user to access portions of the billing information and related invoices pertaining to the authenticated second-entity-class user.