Converting amazon MWS scratchpad queries to API calls
===

I want to know if there is a way to convert my Amazon MWS [scratchpad][1] queries to an API call

e.g. when using the MWS scratchpad I'm given a String to sign

       "mws.amazonservices.co.uk"
       ."/Products/2011-10-01"
       ."AWSAccessKeyId=xxx&Action=ListMatchingProducts"
       ."&MarketplaceId=xxx&Query=star%20wars&SellerId=xxx"
       ."&SignatureMethod=HmacSHA256&SignatureVersion=2
       ."&Timestamp=2012-07-27T18%3A59%3A30Z&Version=2011-10-01

After spending days trying to get [Amazons order API][2] to work I have given up and have been hoping that the following function would return an xml string...but with no luck

    function callAmazon(){
    	$apicall =  "mws.amazonservices.co.uk"
       ."/Products/2011-10-01"
       ."AWSAccessKeyId=xxx&Action=ListMatchingProducts"
       ."&MarketplaceId=xxx&Query=star%20wars&SellerId=xxx"
       ."&SignatureMethod=HmacSHA256&SignatureVersion=2
       ."&Timestamp=2012-07-27T18%3A59%3A30Z&Version=2011-10-01   
    	
    	$resp = simplexml_load_file($apicall);   //make the call
    }

does anyone have any possible suggestions?

  [1]: https://mws.amazonservices.co.uk/scratchpad/index.html
  [2]: https://developer.amazonservices.com/gp/mws/api.html/192-8794163-0963027?ie=UTF8&group=orders&section=orders&version=latest