desk.com OAuth with php.

oauth.php

<?php
  $subdomain = 'your-sitename';
  $req_url   = 'https://'.$subdomain.'.desk.com/oauth/request_token';
  $authurl   = 'https://'.$subdomain.'.desk.com/oauth/authorize';
  $acc_url   = 'https://'.$subdomain.'.desk.com/oauth/access_token';
  $api_url   = 'https://'.$subdomain.'.desk.com/api/v2';
  
  // SET YOUR CALLBACK URL
  $callback  = 'http://localhost:3000/auth/desk/callback';
  
  $conskey   = 'YOUR_CONSUMER_KEY';
  $conssec   = 'YOUR_CONSUMER_SECRET';
  
  session_start();
  
  try {
    $oauth = new OAuth($conskey, $conssec, OAUTH_SIG_METHOD_HMACSHA1);
    $oauth->enableDebug();
    
    $request_token_info = $oauth->getRequestToken($req_url, $callback);
    
    if(!isset($_GET['oauth_token']) && !$_SESSION['state']) {
      $request_token_info = $oauth->getRequestToken($req_url, $api_ret);
      $_SESSION['secret'] = $request_token_info['oauth_token_secret'];
      $_SESSION['state'] = 1;
      header('Location: '.$authurl.'?oauth_token='.$request_token_info['oauth_token']);
      exit;
    } else if($_SESSION['state']==1) {
      $oauth->setToken($_GET['oauth_token'], $_SESSION['secret']);
      $access_token_info = $oauth->getAccessToken($acc_url);
      $_SESSION['state'] = 2;
      $_SESSION['token'] = $access_token_info['oauth_token'];
      $_SESSION['secret'] = $access_token_info['oauth_token_secret'];
    }
     
    $oauth->setToken($_SESSION['token'], $_SESSION['secret']);
    $oauth->fetch("$api_url/cases.json");
    $json = json_decode($oauth->getLastResponse());
    
    print_r($json);
  } catch(OAuthException $E) {
    print_r($E);
  }
?>

Worked perfect. Thanks