1. A system for providing e-commerce and accounting services to organizations and service providers for offerings ordered by members of the organization and delivered by the service provider, comprising: an intermediary; at least one computer having access to an interactive computer network; a searchable database consisting of multiple service providers with associated offerings maintained and monitored by the intermediary; and a transaction server provided by the intermediary in communication with the computer and the database; wherein: individual members of an organization can access the searchable database of service providers with associated offerings via the interactive communication network through the computer; the members can select a service provider from the database; the members can select offerings from the selected service provider; the members can communicate billing information to the intermediary; the billing information can be stored at the intermediary; the transaction server can communicate the offerings selected by the members from the database to the selected service provider; and a consolidated invoice can be provided by the intermediary to the organization for all offerings ordered by the members during a predetermined time period.