A single instance, multi-tenant procurement system, includes an access module to provide access to a plurality of end users associated with an organization to their respective accounts, each account being customized by a super user of the organization, a search engine to execute searches for products offered by one or more suppliers, a transaction module to process and track one or more requisitions generated by the plurality of end users, a business rules module to apply business rules established between the organization and the one or more suppliers to process the requisitions, and a data repository to store data generated on the system.