public function verifyDomain(array $params)
	{
		if (!isset($params['provider'])) {
			throw new MissingArgumentException('provider');
		}

		if (!isset($params['code'])) {
			throw new MissingArgumentException('code');
		}

		if (!isset($params['filename'])) {
			throw new MissingArgumentException('filename');
		}

		return $this->post('app/verify_domain', $params);
	}