We are an agency and had many calls running under v13. In all cases,
we used the following variables in the soap header for authentication:

clientCustomerId
email
password
useragent
developerToken
applicationToken

NOTICE that we did not need to use an auth token because we had all
customers under our MCC.

Based on the example posted in this forum for keywordEstimateRequests,
we are submitting this request. But is says "AUTHENTICATION ERROR".  I
have searched high and low in the documentation, but can't see why
this won't work. Has the authentication requirements for MCC customers
via the API changed? Why won't this run?

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/
envelope/" xmlns:o="https://adwords.google.com/api/adwords/o/v201008";
xmlns:cm="https://adwords.google.com/api/adwords/cm/v201008";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
   <soapenv:Header>
      <o:RequestHeader>
                 <clientCustomerId>...</clientCustomerId>
                 <email>...</email>
                 <password>...</password>
         <cm:applicationToken>...</cm:applicationToken>
         <cm:developerToken>...</cm:developerToken>
         <cm:userAgent>...</cm:userAgent>
      </o:RequestHeader>
   </soapenv:Header>
   <soapenv:Body>
      <o:get>
         <o:selector>
            <o:campaignEstimateRequests>
               <o:adGroupEstimateRequests>
                  <o:keywordEstimateRequests>
                     <o:keyword>
                        <cm:text>digital camera</cm:text>
                        <cm:matchType>EXACT</cm:matchType>
                     </o:keyword>
                  </o:keywordEstimateRequests>
                  <o:maxCpc>
                     <cm:microAmount>1000000</cm:microAmount>
                  </o:maxCpc>
               </o:adGroupEstimateRequests>
               <o:targets xsi:type="cm:CountryTarget">
                  <cm:countryCode>US</cm:countryCode>
               </o:targets>
               <o:targets xsi:type="cm:LanguageTarget">
                  <cm:languageCode>en</cm:languageCode>
               </o:targets>
            </o:campaignEstimateRequests>
         </o:selector>
      </o:get>
   </soapenv:Body>
</soapenv:Envelope>

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