Business Directory (B2B) Website with Backend

Project Requirements: 1) Website for b2b community 2) Two main componets are Reps(buyers) and Sellers 3) Sellers have to pay to post on the site that will be connected to paypal. Everything needs to be processed through the site. Users will not be taken to paypal site 4) Backend to maintain listings. Upgrade, Downgrade and other controls that will provided later Most of the functionality will be similar to other b2b sites. Blueprint doc will be provided for the references and needed to followed. 20% payment will provided after the sample demo/home page. Preference to users with good feedback. It can be long term project depending on your experience and results.