/// <summary>
        ///     Allows the REST API to create or update a product volume discount
        /// </summary>
        /// <param name="parameters">
        ///     Parameters passed in the URL of the REST API call. If there is a first parameter found in the
        ///     URL, the method will assume it is the product volume discount ID (bvin) and that this is an update, otherwise it
        ///     assumes to create a product volume discount.
        /// </param>
        /// <param name="querystring">
        ///     Name/value pairs from the REST API call querystring. This method does not expect any
        ///     querystrings.
        /// </param>
        /// <param name="postdata">Serialized (JSON) version of the ProductVolumeDiscountDTO object</param>
        /// <returns>ProductVolumeDiscountDTO - Serialized (JSON) version of the product volume discount</returns>
        public override string PostAction(string parameters, NameValueCollection querystring, string postdata)
        {
            var data     = string.Empty;
            var bvin     = FirstParameter(parameters);
            var response = new ApiResponse <ProductVolumeDiscountDTO>();

            ProductVolumeDiscountDTO postedItem = null;

            try
            {
                postedItem = Json.ObjectFromJson <ProductVolumeDiscountDTO>(postdata);
            }
            catch (Exception ex)
            {
                response.Errors.Add(new ApiError("EXCEPTION", ex.Message));
                return(Json.ObjectToJson(response));
            }

            // return an error if the posted item isn't there
            if (postedItem == null)
            {
                response.Errors.Add(new ApiError("EXCEPTION", "Post data is missing or null"));
                return(Json.ObjectToJson(response));
            }

            var item = new ProductVolumeDiscount();

            item.FromDto(postedItem);

            if (bvin == string.Empty)
            {
                if (HccApp.CatalogServices.VolumeDiscounts.Create(item))
                {
                    bvin = item.Bvin;
                }
            }
            else
            {
                HccApp.CatalogServices.VolumeDiscounts.Update(item);
            }
            var resultItem = HccApp.CatalogServices.VolumeDiscounts.Find(bvin);

            if (resultItem != null)
            {
                response.Content = resultItem.ToDto();
            }

            data = Json.ObjectToJson(response);
            return(data);
        }
        // Create or Update
        public override string PostAction(string parameters, System.Collections.Specialized.NameValueCollection querystring, string postdata)
        {
            string data = string.Empty;
            string bvin = FirstParameter(parameters);
            ApiResponse <ProductVolumeDiscountDTO> response = new ApiResponse <ProductVolumeDiscountDTO>();

            ProductVolumeDiscountDTO postedItem = null;

            try
            {
                postedItem = MerchantTribe.Web.Json.ObjectFromJson <ProductVolumeDiscountDTO>(postdata);
            }
            catch (Exception ex)
            {
                response.Errors.Add(new ApiError("EXCEPTION", ex.Message));
                return(MerchantTribe.Web.Json.ObjectToJson(response));
            }

            ProductVolumeDiscount item = new ProductVolumeDiscount();

            item.FromDto(postedItem);

            if (bvin == string.Empty)
            {
                if (MTApp.CatalogServices.VolumeDiscounts.Create(item))
                {
                    bvin = item.Bvin;
                }
            }
            else
            {
                MTApp.CatalogServices.VolumeDiscounts.Update(item);
            }
            ProductVolumeDiscount resultItem = MTApp.CatalogServices.VolumeDiscounts.Find(bvin);

            if (resultItem != null)
            {
                response.Content = resultItem.ToDto();
            }

            data = MerchantTribe.Web.Json.ObjectToJson(response);
            return(data);
        }