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hegde_hegdekhegde_hegdek 

Signature error when creating a trip in tripit when creating trip from apex

Hello,
I am creating a trip in tripit using tripitapi from salesforce apex,I am passing the following xml.
xml=<Request>
      <Trip>
        <start_date>2008-12-09</start_date>
        <end_date>2008-12-27</end_date>
        <primary_location>New York, NY</primary_location>
      </Trip>
    </Request>

I have also url encoded the entire above string including 'xml=; using EncodingUtil.urlEncode i am getting invalid signature error.
any help to resolve this error.
regards
kaushik