Shopware: The following example selects a list of products assigned to the category with id 3 and sorts the result set by the cheapest price.

sGetArticlesByCategory.php

$criteria = new Criteria();
$criteria->limit(10);
$criteria->addCondition(new CategoryCondition([3]));
$criteria->addSorting(new PriceSorting());

$context = $this->get('shopware_storefront.context_service')->getShopContext();
$service = $this->get('shopware_search.product_number_search');

/**@var $result ProductNumberSearchResult*/
$result = $service->search($criteria, $context);

$numbers = [];
foreach($result->getProducts() as $product) {
   $numbers[] = $product->getNumber();
}