Helper::getConferenceChatId

public function getConferenceChatId(int $eventId): ?array
{
	$result = [];

	if (!$this->isAvailable())
	{
		return null;
	}

	/** @var EventLink $eventLink */
	$eventLink = self::getLinkFactory()->getEventLinkByEventId($eventId);
	if (!$eventLink)
	{
		return null;
	}

	$chatId = (new SharingConference($eventLink))->getConferenceChatId();
	if (!$chatId)
	{
		return null;
	}

	$result['chatId'] = $chatId;

	return $result;
}