storewithproductsinfo.php

См. документацию.

<?php
 
namespace Bitrix\Catalog\Integration\Report\StoreStock\Entity\Store;
 
use Bitrix\Catalog\Integration\Report\StoreStock\Entity\ProductInfo;
 
class StoreWithProductsInfo extends StoreInfo
{
    protected array $productList = [];

    public function getProductList(): array
    {
        return $this->productList;
    }

    public function addProduct(ProductInfo ...$product): void
    {
        array_push($this->productList, ...$product);
    }

    public function getCalculatedSumPrice(): float
    {
        $sum = 0.0;

        foreach ($this->getProductList() as $product)
        {
            $sum += $product->getPrice() * $product->getQuantity();
        }
 
        return $sum;
    }
}