public static void SetAvailiableQuantity(Article article, Int32 quantity)
        {
            try
            {
                MyMagento.IMagentoApi client = NewClientInstance();

                var getProductTask  = client.GetProductBySku(article.ArticleNumber);
                var productResponse = getProductTask.Result;
                var product         = productResponse.Result;

                if (product == null)
                {
                    throw new Exception($"In Magento no article with the number {article.ArticleNumber} exists");
                }

                var getStockProduct = client.GetStockItemForProduct(product.entity_id);
                var stockResponse   = getStockProduct.Result;
                var stockItem       = stockResponse.Result;

                if (stockItem != null)
                {
                    stockItem.qty         = quantity.ToString(CultureInfo.InvariantCulture).ToDouble();
                    stockItem.is_in_stock = (quantity > 0.0) ? true : false;

                    var updateTask = client.UpdateStockItemForProduct(product.entity_id, stockItem);
                    var result     = updateTask.Result;

                    if (result.HasErrors)
                    {
                        throw new Exception(result.ErrorString);
                    }
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"The amount on stock for article number {article.ArticleNumber} can not be set.", ex);
            }
        }
        /// <summary>
        /// Loads and returns a Magento orders from a given date
        /// </summary>
        /// <param name="from">Date and time of the oldest possible magento transaction</param>
        /// <returns>Magento orders</returns>
        public static IEnumerable <MyMagento.Models.Order> LoadMagentoTransactions(DateTime from)
        {
            List <MyMagento.Models.Order> result = new List <MyMagento.Models.Order>();

            MyMagento.IMagentoApi client = NewClientInstance();

            MyMagento.Models.Filter filters = new MyMagento.Models.Filter();
            filters.FilterExpressions.Add(new MyMagento.Models.FilterExpression("created_at", MyMagento.Models.ExpressionOperator.gt, from.ToString("yyyy-MM-dd 00:00:00")));
            filters.PageSize = maxRecords;

            short page            = 1;
            int   returnedRecords = 0;

            do
            {
                filters.Page = page++;
                var response = client.GetOrders(filters).Result;

                returnedRecords = response.Result.Count;

                if (response.HasErrors)
                {
                    throw new Exception(response.ErrorString);
                }

                var orderList = response.Result;

                if (orderList != null)
                {
                    foreach (var runner in orderList)
                    {
                        result.Add(runner);
                    }
                }
            }while (returnedRecords == maxRecords);

            return(result);
        }