/// <summary>
        /// 收到 "額外訊息目標數" 後會回覆的文字
        /// </summary>
        private async Task <string> GetTargetLimitOfAdditionMessagesTips()
        {
            string result = "";
            TargetLimitForAdditionalMessagesResponseModel responseModel = new TargetLimitForAdditionalMessagesResponseModel();

            responseModel = await _lineClient.GetTheTargetLimitForAdditionsMessagesAsync();

            switch (responseModel.type)
            {
            case TargetLimitForAdditionalMessagesType.none:
                result = "未設定";
                break;

            case TargetLimitForAdditionalMessagesType.limited:
                result = $"目標數量為 : {responseModel.value}";
                break;

            default:
                result = "發生異常,暫時無法查詢";
                break;
            }

            return(result);
        }