WP-InstantPay is no longer available. I recommend using JVZoo instead. It offers much more functionality, integrations and reliability for a lower price. Click Here to check it out.
Big Mike and the team at Incansoft.com have released a new product called WP InstantPay. This new WordPress plugin is the first plugin of it’s kind to use Paypal’s new Adaptive Payment API to secure product delivery while instantly splitting affiliate commissions at the point of sale.