Rails - Sep 2007 - Amazon E-commerce Webservice + soap/wsdlDriver = weird error

Hi,

I''m trying to use amazon E-commerce Webservice using soap/wsdlDriver.
The idea is that a user gives an ISBN, ant to get book informations.

Here''s my code :

require ''soap/wsdlDriver''

URL
''http://webservices.amazon.com/AWSECommerceService/FR/AWSECommerceService.wsdl''

access_key = ''XXXXXXX''

my_isbn10 = ''2841773884'' # Pratique de Ruby on Rails - Eric
Sarrion

factory = SOAP::WSDLDriverFactory.new(URL).create_rpc_driver

mes_params = {
    ''AWSAccessKeyId'' => access_key,
    ''Service''=>''AWSECommerceService'',
    ''SearchIndex'' => ''Books'',
    ''IdType'' => ''ISBN'',
    ''ItemId'' => my_isbn10
  }

result = factory.ItemLookup(mes_params)
puts result.inspect

bud i get a weird error :

Message="Your request is missing required parameters. Required
parameters include ItemId."

I tried changing my hash this way :

mes_params = {
    ''AWSAccessKeyId'' => access_key,
    ''Service''=>''AWSECommerceService'',
    ''Request'' => {
      ''SearchIndex'' => ''Books'',
      ''IdType'' => ''ISBN'',
      ''ItemId'' => my_isbn10
    }
  }

but then, another error occured :

Message="You have exceeded the maximum number of batch requests per
operation.  Each operation may include no more than 2 batch requests."

more strange if possible, when using directly the REST request in my
browser, i get the expected result :

http://webservices.amazon.fr/onca/xml?Service=AWSECommerceService&SubscriptionId=[access_key_HERE]&Operation=ItemLookup&SearchIndex=Books&IdType=ISBN&ItemId=2841773884

if someone can help...

thanks.

PB
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