Log a user in (create an account if user does not exists)

sso-login.php

<?php
define ('PUNCHTAB_CLIENT_ID', '2128281015'); //client_id
define ('PUNCHTAB_SECRET_KEY', '< YOUR SECRET KEY >');
define ('PUNCHTAB_ACCESS_KEY', 'c370b56450e41a8f689fffb2374e7ef4'); //key

$user = array('id' => '2', 'first_name' => 'John', 'last_name' => 'Doe', 'email' => 'john.doe@example.net', 'avatar_link' => 'http://s3.amazonaws.com/punchtab-static/zzzzzz/img/team/lewolf.jpg');
$auth_request = base64_encode(json_encode($user));
$timestamp=time();
$signature = hash_hmac('sha1', "$auth_request $timestamp", PUNCHTAB_SECRET_KEY);

$r = new HttpRequest('https://api.punchtab.com/v1/auth/sso', HttpRequest::METH_POST);

$payload = array('client_id' => PUNCHTAB_CLIENT_ID, 
                    'key' => PUNCHTAB_ACCESS_KEY, 
                    'auth_request' => $auth_request, 
                    'timestamp' => $timestamp, 
                    'signature' => $signature);

$r->addPostFields($payload);

echo $r->send()->getBody();
/* returns:
{
    "status": "connected", 
    "authResponse": {
        "expiresIn": 1209600, 
        "userID": "2_56730", 
        "newUser": false, 
        "uid": "4455181", 
        "accessToken": "6e2ee3d3ccc2db9f0599a56f4b30bdb1"
    }
}
*/

?>