public function showUserProfile($user_id)
    {
        if (!is_numeric($user_id) || 0 >= $user_id) {
            throw new InvalidArgumentException(
                "ShowUserProfile user_id field should be positive integer", 404);
        }

        $command = $this->client->getCommand('ShowUserProfile', array('id' => $user_id));

        return $this->executeCommand($command);
    }