Refreshing a Token with php api

I've been poking through the API and have found various functions in different places that look like they are involved in refreshing tokens.  Nothing I am doing is working.

My code as follows

            // oauth 2 config

            $credentials= array(

              'client_id' => $config['id'],

              'client_secret' => $config['secret'],

              'access_token' => $params['access_token'],

              'refresh_token' => $params['refresh_token']

            );

            $user = new \AdWordsUser(null, $adwords['dev_token'], $adwords['useragent'], null, null, $credentials);

            $handler = $user->GetOAuth2Handler();

            $oauth2Info = $handler->RefreshAccessToken($user->GetOAuth2Info());

            $user->SetOAuth2Info($oauth2Info);

Using this code here I would expect that the access token would get refreshed.  If I try to make any call after it however I get 

{\n \"error\" : \"unauthorized_client\"\n}

Thoughts?

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