getGroupDefinition example

$resultGroups = $this->groupBuilder->findGroupPackages($groupDefinitions, $cart, $context);

        $maximumSetCount = $resultGroups->getLowestCommonGroupCountDenominator($groupDefinitions);

        if ($maximumSetCount <= 0) {
            return new DiscountPackageCollection();
        }

        /** @var string $groupId */
        $groupId = $discount->getPayloadValue('groupId');

        $definition = $this->getGroupDefinition($groupId, $groups);

        $result = $this->groupBuilder->findGroupPackages([$definition], $cart, $context);

        $units = [];

        $addedGroupCount = 0;
        foreach ($result->getGroupResult($definition) as $group) {
            $singleItems = $this->splitQuantities($group->getItems());

            $units[] = new DiscountPackage(new LineItemQuantityCollection($singleItems));