A method for using an internet accessible computer system to conduct business to business operations among a plurality of buyer companies and a plurality of seller companies. In one embodiment, the method includes the steps of registering each of the plurality of seller companies with an internet accessible computer system, wherein each of the plurality of seller companies sells goods to a corresponding one of the plurality of buyer companies, and the corresponding one buyer company makes payment for the goods sold by that seller company; and registering each of the plurality of buyer companies with the internet accessible computer system, wherein the registration of each of the plurality of buyer companies depends on the registration of its corresponding seller company.