I keep receiving this error when I try to use a service. In this instance 
I'm use the campaign service. I had everything working with ClientLogin and 
found that Reports are only supported with OAUTH2 so I'm trying to get that 
implemented.

I have setup my app to retrieve a offline token via the browser redirect 
work flow. I have also setup my adword model to request a new access token 
using the provided refresh token from the previous step. I can take that 
token and use it in the following code:

api.authorize(:oauth2_token => token )

where token:
{"access_token"=>"ya29.AxxxXh6zvQ",
 "token_type"=>"Bearer",
 "expires_in"=>3600,
 "id_token"=>
  "eyJhbxxxB3MO4"}

this returns:
{:access_token=>"ya29.AHxxxxEJXh6zvQ",
 :refresh_token=>nil,
 :issued_at=>2013-07-19 14:56:06 -0400,
 :expires_in=>3600,
 :id_token=>
  "eyJhbxxxLB3MO4"}

When I use this api object to call the campaign service I get the output 
provided below. The reporting download is the final piece needed to 
approval and I've searched all over this group and the web and can't find 
anything that helps. I'm using the latest versions of the ruby gem: 
google-ads-common (0.9.3) and google-adwords-api (0.9.3) 

SOAP request: 
https://adwords.google.com/api/adwords/cm/v201302/CampaignService
Accept-Encoding: gzip,deflate, SOAPAction: "get", User-Agent: bw_console 
(AwApi-Ruby/0.9.3, Common-Ruby/0.9.3, Savon/1.2.0, ruby/1.9.3, HTTPI/1.1.1, 
curb), Authorization: Bearer ya29.AHxxxxxXh6zvQ, Content-Type: 
text/xml;charset=UTF-8, Content-Length: 837
<?xml version="1.0" encoding="UTF-8"?><env:Envelope 
xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xmlns:wsdl="https://adwords.google.com/api/adwords/cm/v201302"; 
xmlns:env="http://schemas.xmlsoap.org/soap/envelope/";><env:Header><wsdl:RequestHeader
 
xmlns="https://adwords.google.com/api/adwords/cm/v201302";><userAgent>console 
(AwApi-Ruby/0.9.3, Common-Ruby/0.9.3, Savon/1.2.0, ruby/1.9.3, HTTPI/1.1.1, 
curb)</userAgent><developerToken>h6Axxxweg</developerToken></wsdl:RequestHeader></env:Header><env:Body><get
 
xmlns="https://adwords.google.com/api/adwords/cm/v201302";><serviceSelector><fields>Id</fields><fields>Name</fields><fields>Status</fields><ordering><field>Name</field><sortOrder>ASCENDING</sortOrder></ordering></serviceSelector></get></env:Body></env:Envelope>
HTTPI executes HTTP POST using the curb adapter
SOAP response (status 500):
<soap:Envelope 
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";><soap:Header><ResponseHeader
 
xmlns="https://adwords.google.com/api/adwords/cm/v201302";><requestId>0004e1e1b8b62a800aed881c00001a3b</requestId><serviceName>CampaignService</serviceName><methodName>get</methodName><operations>0</operations><responseTime>23</responseTime><units>0</units></ResponseHeader></soap:Header><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>[AuthenticationError.OAUTH_TOKEN_INVALID
 
@ ; trigger:'&lt;null&gt;']</faultstring><detail><ApiExceptionFault 
xmlns="https://adwords.google.com/api/adwords/cm/v201302";><message>[AuthenticationError.OAUTH_TOKEN_INVALID
 
@ ; 
trigger:'&lt;null&gt;']</message><ApplicationException.Type>ApiException</ApplicationException.Type><errors
 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="AuthenticationError"><fieldPath></fieldPath><trigger>&lt;null&gt;</trigger><errorString>AuthenticationError.OAUTH_TOKEN_INVALID</errorString><ApiError.Type>AuthenticationError</ApiError.Type><reason>OAUTH_TOKEN_INVALID</reason></errors></ApiExceptionFault></detail></soap:Fault></soap:Body></soap:Envelope>
Content-Type: text/xml; charset=UTF-8, Date: Fri, 19 Jul 2013 18:44:49 GMT, 
Expires: Fri, 19 Jul 2013 18:44:49 GMT, Cache-Control: private, max-age=0, 
X-Content-Type-Options: nosniff, X-Frame-Options: SAMEORIGIN, 
X-XSS-Protection: 1; mode=block, Server: GSE, Transfer-Encoding: chunked
AdwordsApi::V201302::CampaignService::ApiException: 
[AuthenticationError.OAUTH_TOKEN_INVALID @ ; trigger:'<null>']

Thank you to anyone that can help. I really need to get this integration 
completed.

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