/**
  * setDefaultApplication - Will set the static default appId and appSecret
  *   to be used for API requests.
  *
  * @param string $appId Application ID to use by default
  * @param string $appSecret App secret value to use by default
  */
 public static function setDefaultApplication($appId, $appSecret)
 {
     self::$defaultAppId = $appId;
     self::$defaultAppSecret = $appSecret;
 }