Integration with Sage 300

We are in the process building an e-commerce application that we want to integrate with Sage 300 ERP. The e-commerce solution will allow customers to order goods from our website. We are using Microsoft .NET and web services. The goal is to create the sales order and then present the user with the details of the order. If the user then pays for the order, then we want the order to be confirmed in our Sage 300 ERP along with the payment information. The freelancer must develop a .NET web service that we can use to interact with the Sage 300 system to perform the following activities. 1. Get list of products in our Sage 300 2. Get List of customers in our Sage 300 3. Get customers in Zip code from our Sage 300 4. Create sales order in our Sage 300 5. Post sales order (when payment is received) 6. Get list of sales orders by sales person and date range Other information The Sage 300 ERP is hosted in Linux environment The integration must be in .NET C# and be able to interact with the Sage 300 hosted in Linux environment