/// <summary>
        /// Create a CustomsItem.
        /// </summary>
        /// <param name="customsItem">Customs item parameters</param>
        /// <returns>EasyPost.CustomsItem instance.</returns>
        public async Task <CustomsItem> CreateCustomsItem(
            CustomsItem customsItem)
        {
            var request = new EasyPostRequest("customs_items", Method.POST);

            request.AddBody(customsItem.AsDictionary(), "customs_item");

            return(await Execute <CustomsItem>(request));
        }