SingDocumentConfig::sign

public function sign(array $config): Result
{
	//there is no reason to send token because we'll rewrite it.
	unset($config['token']);

	$clientId = (new Configuration())->getCloudRegistrationData()['clientId'];

	/** @see BitrixDocumentProxyControllerSignDocumentConfiguration::signAction */
	return $this->performRequest('documentproxy.SignDocumentConfiguration.sign', [
		'clientId' => $clientId,
		'config' => $config,
	]);
}