PayPal Express Checkout: Website Payment Pro INTEGRATION

Yellow Rat Bastard ([login to view URL]) has built its own custom shopping cart and we need to integrate Paypal's "express checkout" into our site. We've built all the required pages for both our site and on the Paypal side, but we need implement 3 "integration points" between our checkout pages and Paypal's web services. We require someone who has WORKED with Paypal's .NET SDK (software development kit). This is the .NET/C# based API that will be used to "wire up" our pages with PayPal. We have a on-site developer that will help you. We estimate the cost of this work to be between $100 and $300, but please give us your best more realistic bid. Thank you. REQUIREMENTS: 1. You know C# and .Net 2. You have experience with integrating Paypal into a sequence of custom shopping cart web pages. 3. You MUST be able to work onsite at our Soho New York office