public function preProcessAuthenticate(array $args)
    {

        $args      = $args[0];
        $signature = isset($args->signature) ? $args->signature : null;
        $extra     = isset($args->extra) ? $args->extra : null;

        if (!$signature) {
            return ['ERROR'];
        }

        return $this->processAuthenticate($signature, $extra);
    }