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Log into your Google Account, and then visit https://code.google.com/apis/console/. This will take you to a page that invites you to create a project with the Google API. Click on Create project….

<?php

$cScope         =   'https://www.googleapis.com/auth/calendar';

$cClientID      =   '';

$cClientSecret  =   '';

$cRedirectURI   =   'urn:ietf:wg:oauth:2.0:oob';

  

$cAuthCode      =   '';

if (empty($cAuthCode)) {

    $rsParams = array(

                        'response_type' => 'code',

                        'client_id' => $cClientID,

                        'redirect_uri' => $cRedirectURI,

                        'access_type' => 'offline',

                        'scope' => $cScope,

                        'approval_prompt' => 'force'

                     );

    $cOauthURL = 'https://accounts.google.com/o/oauth2/auth?' . http_build_query($rsParams);

    echo("Go ton$cOauthURLnand enter the given value into this script under $cAuthCoden");

    exit();

} // ends if (empty($cAuthCode))

elseif (empty($cRefreshToken)) {

    $cTokenURL = 'https://accounts.google.com/o/oauth2/token';

    $rsPostData = array(

                        'code'          =>   $cAuthCode,

                        'client_id'     =>   $cClientID,

                        'client_secret' =>   $cClientSecret,

                        'redirect_uri'  =>   $cRedirectURI,

                        'grant_type'    =>   'authorization_code',

                        );

    $ch = curl_init();

  

    curl_setopt($ch, CURLOPT_URL, $cTokenURL);

    curl_setopt($ch, CURLOPT_POST, 1);

    curl_setopt($ch, CURLOPT_POSTFIELDS, $rsPostData);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); //For Localhost only

    $cTokenReturn = curl_exec($ch);

    $oToken = json_decode($cTokenReturn);

    echo("Here is your Refresh Token for your application.  Do not loose this!nn");

    echo("Refresh Token = '" . $oToken->refresh_token . "';n");

} // ends

?>

Before running this script, you will need to enter your Client ID ($cClientID) and Client Secret ($cClientSecret) as we found on the API page with Google. Once these values are added, run this script from the command line like this: php oauth-setup.php. You should see output like this:

Step: 7

samx@samx-desktop:~/code$ php oauth-setup.php 
Go to
https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=##########################&redirect_uri=###############&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fcalendar 

and enter the given value into this script under $cAuthCode

Step: 8

thomas@thomas-desktop:~/code$ php oauth-setup.php 
Here is your Refresh Token for your application.  Do not loose this!

Refresh Token = '#####################################';