Problem linking into Amazon Advertising API

Question

Hi,
I am quite new to Flex and have been connecting to the Amazon Advertising API to create a sample application. The problem is that as of August 15th, the API requires an TimeStamp and Signature parameter. I created them by using the Signed Requests Helper at http://associates-amazon.s3.amazonaws.com/signed-requests/helper/index.html and plugged the values into the http request as follows:
<mx:HTTPService 
id="searchRPC" showBusyCursor="true" url="http://ecs.amazonaws.com/onca/xml" method="POST" result="searchResultHandler(event)" fault="searchFaultHandler(event)"
>
<mx:request >
<AWSAccessKeyId>MYACCESSID</AWSAccessKeyId>
<Keywords>{escape(this.parentDocument.keywordsTextInput.text)}</Keywords>
<Operation>ItemSearch</Operation>
<ResponseGroup>Medium,Reviews</ResponseGroup>
<SearchIndex>Books</SearchIndex>
<Service>AWSECommerceService</Service>
<TimeStamp>2009-08-18T16:23:16.000Z</TimeStamp>
<Title>{escape(this.parentDocument.titleTextInput.text)}</Title>
<Version>2009-07-01</Version>
<Signature>HDDIYtjmLPiP47FGFDf2aTe9TC0BeeM5uUUL7P2Paww=</Signature>
</mx:request>  
</mx:HTTPService>
Here is what the signed request would look like if passed as a url
http://ecs.amazonaws.com/onca/xml?AWSAccessKeyId=MYACCESSID&Keywords=flex%0D&Operation=Ite mSearch%0D&ResponseGroup=Medium%2CReviews%0D&SearchIndex=Books%0D&Service=AWSECommerceServ ice%0D&Timestamp=2009-08-18T16%3A23%3A16.000Z&Title=Training%0D&Version=2009-03-31%0D&Sign ature=HDDIYtjmLPiP47FGFDf2aTe9TC0BeeM5uUUL7P2Paww%3D
It shoots back a fault saying that my timestamp and signature are invalid.
I would appreciate it if anyone could help me with this.
Anthony

Answer 1

Is this the right way? How to implement it right. Is there any good tutorial regarding this topic?
Regarding the <xsl:template match="/ItemAttributes"> I have seen that some people put one or more slashes in front of the itemattributes. What does it mean? How can I get the attributes of the LargeImages. What do I have to take care about when my structure is deeper? Sorry.. questions over questions