Trying to access to adword API with salesforce

[noam.dg...@conduit.com]

I'm trying to access adwords API with the following code in salesforce:

HttpResponse res = new HttpResponse();
Http http = new Http();
 
req.setEndpoint('https://adwords.google.com/api/adwords/reportdownload/v201309');
req.setMethod('POST');
req.setHeader('Authorization', 'Bearer 
ya29.1.AADtN_XN5J-ld2VbjCwzwMdWgCf62FoJ5dhdw5LIDLO3hA_P6PkhE43w4jLDzKsg');
        req.setHeader('developerToken', 'Ox80jWNwZ9jZa5175T-Q3A');
        req.setHeader('clientCustomerId', '203-167-7812');
        req.setHeader('returnMoneyInMicros', 'false');
        req.setHeader('Content-type', 'application/x-www-form-urlencoded'); 
        
        
        String body = '<reportDefinition 
xmlns="https://adwords.google.com/api/adwords/cm/v201309";>\n' + 
        '<selector>\n' +
    '<fields>CampaignId</fields>\n' +
    '<fields>Id</fields>\n' +
    '<fields>Impressions</fields>\n' +
    '<fields>Clicks</fields>\n' +
    '<fields>Cost</fields>\n' +
        '<predicates>\n' + 
      '<field>Status</field>\n' +
      '<operator>IN</operator>\n' +
      '<values>ENABLED</values>\n' +
      '<values>PAUSED</values>\n' +
    '</predicates>\n' +
  '</selector>\n' +
  '<reportName>test</reportName>\n' +
  '<reportType>ADGROUP_PERFORMANCE_REPORT</reportType>\n' +
  '<dateRangeType>LAST_7_DAYS</dateRangeType>\n' + 
  '<downloadFormat>CSV</downloadFormat>\n' + 
'</reportDefinition>\n';
        req.setBody('__rdxml=' + EncodingUtil.urlEncode(body, 'UTF-8'));  
        system.debug('AM --> body ' + req.getBody());

        try {
        res = http.send(req);         
        System.debug(res.getBody());         
    } catch(System.CalloutException e) {
        System.debug('Callout error: '+ e);
        System.debug(res.toString());
    } 


And I'm getting the following error:
<?xml version="1.0" encoding="UTF-8" 
standalone="yes"?><reportDownloadError><ApiError><type>AuthenticationError.OAUTH_TOKEN_INVALID</type><trigger>&lt;null&gt;</trigger><fieldPath></fieldPath></ApiError></reportDownloadError>

The token is valid and new

Please advise 
Thanks

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