private ResponseClass DeserializeEditItem(Guid sessionID, Guid storeID, Guid itemId, int?amount, double?rank, double?price, string name = null, string categories = null, string keyWords = null)
        {
            string        json     = marketFacade.EditItem(sessionID, storeID, itemId, amount, rank, price, name, categories, keyWords);
            ResponseClass response = JsonConvert.DeserializeObject <ResponseClass>(json);

            return(response);
        }