Help with Operations and Response Groups
http://ecs.amazonaws.com/onca/xml? Service=AWSECommerceService& AWSAccessKeyId=[AWS Access Key ID]
& Operation=Help& HelpType=Operation& About=CartAdd
A snippet from the response shows the operation's parameters.
<OperationInformation> <Name>CartAdd</Name> <RequiredParameters> <Parameter>AssociateTag</Parameter> <Parameter>CartId</Parameter> <Parameter>HMAC</Parameter> <Parameter>Items</Parameter> </RequiredParameters> <AvailableParameters> <Parameter>AWSAccessKeyId</Parameter> <Parameter>ContentType</Parameter> <Parameter>Marketplace</Parameter> <Parameter>MarketplaceDomain</Parameter> <Parameter>MergeCart</Parameter> <Parameter>Style</Parameter> <Parameter>Validate</Parameter> <Parameter>Version</Parameter> <Parameter>XMLEscaping</Parameter> </AvailableParameters>
HelpType is either "Operation" or "ResponseGroup." The About parameter is set to an Product Advertising API operation or response group.