Notifier::getChannel

static function getChannel(): ?int
{
	$classSupport = self::detectSupportBot();
	$res = BitrixImModelChatTable::getList([
		'select' => ['ID', 'ENTITY_ID'],
		'filter' => [
			'=ENTITY_TYPE' => self::CHAT_ENTITY_TYPE,
			'=ENTITY_ID' => $classSupport::getBotId(),
		]
	]);
	if ($chat = $res->fetch())
	{
		return (int)$chat['ID'];
	}

	return null;
}