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);
}