/**
  * Test the submitted API key using a dummy TMDb instance to fetch
  * API's configuration. Return the request result array.
  *
  * @since    1.0
  * 
  * @param    string    $key API Key
  *
  * @return   array     API configuration request result
  */
 private static function check_api_key($key)
 {
     $tmdb = new TMDb($config = true, $dummy = false);
     $check = $tmdb->checkApiKey($key);
     return $check;
 }