The present invention relates to a method and system for providing e-commerce and accounting services to organizations and service providers for offerings ordered by the organization via an on-line interactive communication network. In particular, the present invention relates to a method and system whereby a third party intermediary can absorb certain payment, collection and billing functions on behalf of an organization and service providers which provide services to the organization. The term service provider as used herein refers to any entity or individual that provides a service, including the service of providing goods.