public virtual async Task <InventoryStockItemListResponse> GetStockItemsWithoutSkuAsync(IEnumerable <string> skusOrIds, IEnumerable <int> scopes, Mark mark = null)
        {
            try
            {
                var pageSize = 500;
                var res      = await this.GetStockItemsPageAsync(1, pageSize).ConfigureAwait(false);

                if (res.catalogInventoryStockRegistryV1GetLowStockItemsResponse.result.totalCount <= pageSize)
                {
                    return(new InventoryStockItemListResponse(new[] { Tuple.Create(1, res.catalogInventoryStockRegistryV1GetLowStockItemsResponse.result) }));
                }

                var pagingModel = new PagingModel(pageSize, 0);
                var responses   = await pagingModel.GetPages(res.catalogInventoryStockRegistryV1GetLowStockItemsResponse.result.totalCount).ProcessInBatchAsync(10, async x =>
                {
                    var pageResp = await this.GetStockItemsPageAsync(x, pageSize).ConfigureAwait(false);
                    return(Tuple.Create(x, pageResp.catalogInventoryStockRegistryV1GetLowStockItemsResponse.result));
                }).ConfigureAwait(false);

                var inventory = new InventoryStockItemListResponse(responses);

                return(inventory);
            }
            catch (Exception exc)
            {
                throw new MagentoSoapException(string.Format("An error occured during GetStockItemsWithoutSkuAsync({0})", ""), exc);
            }
        }
        public async Task <InventoryStockItemListResponse> GetStockItemsWithoutSkuAsync(IEnumerable <string> skusOrIds, IEnumerable <int> scopes, Mark mark = null)
        {
            var pages = new PagingModel(1000, 0).GetPages(skusOrIds).ToList();

            var pagesResult = await pages.ProcessInBatchAsync(4, async x => await this.GetStockItemsAsync( x, scopes ).ConfigureAwait(false)).ConfigureAwait(false);

            var result = new InventoryStockItemListResponse(pagesResult.SelectMany(x => x.InventoryStockItems).ToList());

            return(result);
        }