function admin_oauthCallBack($website_id = '') {
        $this->autoRender = false;

        $this->loadModel('Website');
        // Code begins
        $authorizationCode = '';
        $error = '';

        $oauthInfo = array();

        if (!empty($_REQUEST['code'])) {
            $authorizationCode = trim($_REQUEST['code']);
        }

        if (!empty($_REQUEST['error'])) {
            $error = trim($_REQUEST['error']);
        }

        if (!empty($_REQUEST['state'])) {
            $website_id = $_REQUEST['state'];
        }

        if (!empty($authorizationCode)) {

            $data = $this->getAccessToken($authorizationCode);
            //pr($data); die;

            if (!empty($data) && empty($data['error'])) {

                $accessToken = $data['access_token'];
                $refreshToken = $data['refresh_token'];
                // Customer Service (Single Adwords Account)
                $clientInfo = $this->getClientInfo($accessToken, $refreshToken);


                // Managed Customer Service (Manage Multiple Adwords Account)
                if (is_string($clientInfo)) {
                    $this->redirect(array('controller' => 'websites', 'action' => 'listClients', $clientInfo, base64_encode($accessToken), base64_encode($refreshToken), base64_encode($website_id)));
                }

                if (!empty($clientInfo) && is_array($clientInfo)) {
                    $oauth_register_email = $this->getOauthRegisterEmail($accessToken);
                    $update_data = array(
                        'aw_oauth_refresh_token' => "'" . $clientInfo['oauth_refresh_token'] . "'",
                        'aw_oauth_register_email' => "'" . $oauth_register_email . "'",
                        'aw_client_id' => $clientInfo['client_id']
                    );

                    $condition = array('id' => $website_id);

                    $this->Website->updateAll($update_data, $condition);
                    $this->redirect(array('controller' => 'websites', 'action' => 'index', 'admin' => true)); // clients
                } else {
                    $this->redirect(array('controller' => 'websites', 'action' => 'index', 'admin' => true));
                }
            } else {
                $this->redirect(array('controller' => 'websites', 'action' => 'index', 'admin' => true));
            }
        } else if (!empty($error)) {
            $this->Session->setFlash('Access Denied by User.', 'default', array('class' => 'error'));
            $this->redirect(array('controller' => 'websites', 'action' => 'index', 'admin' => true));
        } else {
            header("Location:https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=" . Configure::read('AW_CLIENT_ID') . "&redirect_uri=" . Configure::read('REDIRECT_URI') . "&access_type=offline&approval_prompt=force&state=" . $website_id . "&scope=https://adwords.google.com/api/adwords/email");
            die;
        }
    }

    function admin_linkAccount($client_id, $website_id, $access_token, $refresh_token) {
        $clientId = base64_decode($client_id);
        $websiteId = base64_decode($website_id);
        $accessToken = base64_decode($access_token);
        $refreshToken = base64_decode($refresh_token);
        $this->loadModel('Website');
        $oauth_register_email = $this->getOauthRegisterEmail($accessToken);

        $update_data = array(
            'aw_oauth_refresh_token' => "'" . $refreshToken . "'",
            'aw_oauth_register_email' => "'" . $oauth_register_email . "'",
            'aw_client_id' => $clientId
        );

        $condition = array('id' => $websiteId);
        $this->Website->updateAll($update_data, $condition);
        $this->redirect(array('controller' => 'websites', 'action' => 'index', 'admin' => true));
    }

    function getClientInfo($access_token, $refresh_token) {

        $clients = array();
        try {

            $oauth2_info = array('client_id' => Configure::read('AW_CLIENT_ID'),
                'client_secret' => Configure::read('AW_CLIENT_SECRET'),
                'refresh_token' => $refresh_token
            );

            $user = new AdWordsUser();
            $user->SetOAuth2Info($oauth2_info);
            $user->LogAll();

            $customerService = $user->GetService('CustomerService', ADWORDS_VERSION);


            // Make the get request.
            $result = $customerService->get();

            if (!empty($result)) {

                $i = 0;

                $isMCC = $result->canManageClients;

                if (!$isMCC) {
                    $clients['client_id'] = $result->customerId;
                    $clients['oauth_refresh_token'] = $refresh_token;
                } else {
                    return $result->customerId;
                }
            }
        } catch (Exception $e) {

        }

        return $clients;
    }

    function getOauthRegisterEmail($access_token) {
        $email = '';

        if (!empty($access_token)) {
            $url = "https://www.googleapis.com/oauth2/v2/userinfo?access_token=" . $access_token;

            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);

            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

            $Rec_Data = curl_exec($ch);

            if (curl_exec($ch) === false) {
                return $email;
            }

            $Rec_Data = json_decode($Rec_Data, true);

            if (!empty($Rec_Data['email'])) {
                $email = trim($Rec_Data['email']);
            }
        }

        return $email;
    }

    function getAccessToken($code) {

        $Rec_Data = array();

        if (!empty($code)) {

            $postFields = 'client_id=' . Configure::read('AW_CLIENT_ID') . '&client_secret=' . Configure::read('AW_CLIENT_SECRET') . '&code=' . $code . '&grant_type=authorization_code&redirect_uri=' . Configure::read('REDIRECT_URI');

            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, 'https://accounts.google.com/o/oauth2/token');
            curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);

            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

            $Rec_Data = curl_exec($ch);


            if (curl_exec($ch) === false) {
                return $Rec_Data;
                //echo 'Curl error: ' . curl_error($ch);
            }

            $Rec_Data = json_decode($Rec_Data, true);
        }
        return $Rec_Data;
    }
}