How Do I Get A Refresh Token?

[NEED SOME HELP]

This code is not working:


<?php
/**
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Google\AdsApi\Examples\Auth;

require __DIR__ . '/../api/vendor/autoload.php';

use Google\Auth\CredentialsLoader;
use Google\Auth\OAuth2;

/**
 * Command line example that prompts you for the required OAuth2 credentials
 * to generate an offline refresh token for installed application flows.d
 *
 * <p>You can then use this refresh token to generate access tokens to
 * authenticate against the ads API(s) you're using.
 */
class GetRefreshToken
{

    /**
     * @var string the OAuth2 scope for the AdWords API
     * @see 
https://developers.google.com/adwords/api/docs/guides/authentication#scope
     */
    const ADWORDS_API_SCOPE = 'https://www.googleapis.com/auth/adwords';

    /**
     * @var string the OAuth2 scope for the Ad Manger API
     * @see 
https://developers.google.com/ad-manager/docs/authentication#scope
     */
    const AD_MANAGER_API_SCOPE = 'https://www.googleapis.com/auth/dfp';

    /**
     * @var string the Google OAuth2 authorization URI for OAuth2 requests
     * @see 
https://developers.google.com/identity/protocols/OAuth2InstalledApp#formingtheurl
     */
    const AUTHORIZATION_URI = 
'https://accounts.google.com/o/oauth2/v2/auth';

    /**
     * @var string the redirect URI for OAuth2 installed application flows
     * @see 
https://developers.google.com/identity/protocols/OAuth2InstalledApp#formingtheurl
     */
const REDIRECT_URI = 'https://www.gofishmarketplace.com/adw/token.php';

    public static function main()
    {
        $PRODUCTS = [
            ['AdWords API', self::ADWORDS_API_SCOPE],
            ['Ad Manager API', self::AD_MANAGER_API_SCOPE],
            ['AdWords API and Ad Manager API', self::ADWORDS_API_SCOPE . ' '
                . self::AD_MANAGER_API_SCOPE]
        ];

        $stdin = fopen('php://stdin', 'r');

        
        $clientId = 
"672650959136-6ouf55tvmmof8uv5cq5ap5qf92qvtiah.apps.googleusercontent.com";

       
        $clientSecret = "cOt0cMDv1kFgU7org7o7SAQ5";

       
        $api = 2;

        if ($api === 2) {
            print '[OPTIONAL] enter any additional OAuth2 scopes as a space 
'
                . 'delimited string here (the AdWords API and Ad Manager 
API '
                . 'scopes are already included): ';
        } else {
            printf(
                '[OPTIONAL] enter any additional OAuth2 scopes as a space '
                . 'delimited string here (the %s scope is already 
included): ',
                $PRODUCTS[$api][0]
            );
        }
        $scopes = $PRODUCTS[$api][1] ;//. ' ' . trim(fgets($stdin));

        $oauth2 = new OAuth2(
            [
                'authorizationUri' => self::AUTHORIZATION_URI,
                'redirectUri' => self::REDIRECT_URI,
                'tokenCredentialUri' => 
CredentialsLoader::TOKEN_CREDENTIAL_URI,
                'clientId' => $clientId,
                'clientSecret' => $clientSecret,
                'scope' => $scopes
            ]
        );

        //echo $oauth2->buildFullAuthorizationUri();exit;
        //
        $code = 
urldecode($_GET['code']);//"4/F0gGXN6S43cmsx6sAxAjlvEcu35rF1uvQH2ex_VPv8hb1vmGaxkPciDDOh5j5V4pAG_-X0nZ_JPdwjF6og0eANVQ";
       // fclose($stdin);
       // print "\n";

        $oauth2->setCode($code);

        $authToken = $oauth2->fetchAuthToken();

        printf("Your refresh token is: %s\n\n", 
$authToken['refresh_token']);
        printf(
            "Copy the following lines to your 'adsapi_php.ini' file:\n"
            . "clientId = \"%s\"\nclientSecret = \"%s\"\n"
            . "refreshToken = \"%s\"\n",
            $clientId,
            $clientSecret,
            $authToken['refresh_token']
        );
    }
}

GetRefreshToken::main();

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