How to get qty from all assigned sources (Multi warehouse inventory) programmatically i.e sources and corresponding quantities.


You need to use Source Item management APIs: https://devdocs.magento.com/guides/v2.3/rest/modules/inventory/manage-source-items.html

For example, to retrieve all Quantities among all Sources where SKU = new_product2 located

you can do with next REST request: GET /V1/inventory/source-items?searchCriteria[filter_groups][0][filters][0][field]=sku&searchCriteria[filter_groups][0][filters][0][value]=new_product2&searchCriteria[filter_groups][0][filters][0][condition_type]=eq

Or in the code you can just call next service: namespace Magento\InventoryApi\Api;

 * Sugar service for find SourceItems by SKU
 * @api
interface GetSourceItemsBySkuInterface
     * @param string $sku
     * @return \Magento\InventoryApi\Api\Data\SourceItemInterface[]
    public function execute(string $sku): array;


$sourceItemsBySku = $this->getSourceItemsBySku->execute($product->getSku());
$config['stockData'][$productId] = [];

foreach ($sourceItemsBySku as $sourceItem) {
    $source = $sourceItem->getSourceCode();
    $quantity = $sourceItem->getQuantity();

    $config['stockData'][$productId][$source] = $quantity;

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