title: Implementing Yahoo oAuth Authentication
body: <p>Hello I trying to implement a Yahoo oAuth login but I am not receiving any response.</p>
  
  <p>Here is what I have:</p>
  
  <pre><code>YahooSession::clearSession();
  $hasSession = YahooSession::hasSession(
      $this-&gt;Yahoo_API_CONFIG['appKey'],
      $this-&gt;Yahoo_API_CONFIG['appSecret'],
      $this-&gt;Yahoo_API_CONFIG['appId']
  );
  
  if($hasSession == FALSE) {   
      $callback = SITE_URL.'/Homes/user_yahoo_login';     
      $auth_url = YahooSession::createAuthorizationUrl(
          $this-&gt;Yahoo_API_CONFIG['appKey'],
          $this-&gt;Yahoo_API_CONFIG['appSecret'],
          $callback
      );
  }
  else {   
      $auth_url = SITE_URL.'/Homes/user_yahoo_login';
  }
  echo $auth_url;
  die;
  </code></pre>
  
  <p>No authentication popup is shown.</p>