What is a Signature or Timestamp for an Amazon E-Commerce Web Service?

Question

Sign up for Amazon Web Services.

Then try the following url:

http://ecs.amazonaws.com/onca/xml?Service=AWSECommerceService&Operation=ItemLookup&AWSAccessKeyId=YOURKEY

If you have my experience, you will see:

<Error>
  <Code>AWS.MinimumParameterRequirement</Code>
    <Message>
      Your request should have atleast 1 of the following parameters: Signature, Timestamp.
    </Message>
</Error>

What am I trying to say? What are the Signature and Timestamp options?

This is some kind of n00b problem, but finding the answer is not obvious. I Googled for "MinimumParameterRequirement". I looked at http://docs.amazonwebservices.com/AWSEcommerceService/2007-01-17 and http://s3.amazonaws.com/awsdocs/ECS/20080819/QRC-AAWS-2008-08-19.pdf and http : //docs.amazonwebservices.com/AWSEcommerceService/2007-01-17/ApiReference/ErrorCodesAndMessages.html .

In fact, even a link to the latest e-commerce API document would be nice. Is 2008-08-19 the last?

Answer 1

: http://docs.amazonwebservices.com/AmazonFPS/latest/FPSAdvancedGuide/index.html?APPNDX_GeneratingaSignature.html

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