Sharing::getSelectedChannelId

protected function getSelectedChannelId(): ?string
{
	$result = null;

	if ($this->getEntityId() > 0 && $this->getEntityTypeId() > 0)
	{
		$entity = new Crm\ItemIdentifier($this->getEntityTypeId(), $this->getEntityId());
		$result = Crm\Integration\Calendar\Notification\Manager::getOptimalChannelId($entity);
	}

	return $result;
}