public ActionResult <ProductInstanceModel> GetInstance(long id)
        {
            if (id == 0)
            {
                return(BadRequest($"Id was 0"));
            }
            var productInstance = _productManagement.GetInstance(id);

            if (productInstance == null)
            {
                return(NotFound());
            }
            return(_productConverter.ConvertProductInstance(productInstance));
        }