Design a Magento Website With API Capabilty

Need Magento based e-comm website that will receive inventory feeds & tracking information from supplier and send orders. Specs: "API follows the REST specification and all calls are made using GET or POST requests to the specified endpoints. All calls can be made by using cURL or the HTTP tools which come with any standard web programming language. For the purposes of the documentation, we will be showing calls made using cURL on the command line, but you can make the same calls using PHP, Java, Ruby, etc. API response data can be returned in JSON or XML format by specifying "Content-Type: application/json" or "Content-Type: application/xml" in the header. If no content type is specified, the default format is JSON. For POST requests, the incoming content will be parsed depending on the Content-Type header, and also defaults to JSON."