CatalogManager::getProductVariations

public function getProductVariations($productIds): array
{
	$skus = [];

	foreach ($productIds as $productId)
	{
		$sku =
			Catalogv2IoCServiceContainer::getRepositoryFacade()
				->loadVariation((int)$productId)
		;

		if (!$sku)
		{
			continue;
		}

		$skus[] = $sku;
	}

	return $skus;
}