Ebay API Integration

What I need done: Our company has begun working with the EBay API and would like to integrate our custom CRM/Order processing system with the EBay Trade Service API. We would like the ability to: - Manage EBay store preferences, categories, and custom page - Post new Ebay items for sale including price, picture, description, and availability from our existing item management page - Integrate EBay/PayPal orders with our order processing system (essentially adding a new order in our system) - Send invoices to buyers - Set promotional sale items - Retrieve and reply to shop messages Our current system is developed in C#.Net/SQL and utilizes business objects and data access layers. Integration documentation will be available and the main system developer will support and manage this project. What I already have versus what the provider will build: We have the EBay API keys and certificates in place and currently only use the API for item searching. Our existing system handles all necessary item and order data including part numbers, descriptions, pictures, inventory levels, customer and order info. Essentially we will need to integrate this data with the EBay system. Some data structure modifications will need to be made to our existing system to trap new EBay data, but the majority will simply pass thru to the API for posting. New screens will need to be developed to address the store preferences and messages, and the existing screens for orders and items will need to be modified. Other context that the provider will need to know: We have built a customer Asp.Net Ajax control library that functions the same way as standard Asp.Net web controls. The provider will need to use these control for the development. The controls are very easy to use and complete documentation and examples will be available. Specific expertise that I am seeking: In addition to Asp.Net, C# and SQL expertise, the provider must be familiar with the EBay API prior to starting on this project. Timeframe for delivery: This will need to be done by November 1st.