private void btnCheckIsMember_Click(object sender, EventArgs e)
        {
            try
            {
                Response response = closedownService.CheckIsMember(txtCorpNum.Text, LinkID);

                MessageBox.Show(response.code.ToString() + " | " + response.message);
            }
            catch (PopbillException ex)
            {
                MessageBox.Show(ex.code.ToString() + " | " + ex.Message);
            }
        }
        /*
         * 해당 사업자의 파트너 연동회원 가입여부를 확인합니다.
         * - https://docs.popbill.com/closedown/dotnetcore/api#CheckIsMember
         */
        public IActionResult CheckIsMember()
        {
            try
            {
                //링크아이디
                string linkID = "TESTER";

                var response = _closedownService.CheckIsMember(corpNum, linkID);
                return(View("Response", response));
            }
            catch (PopbillException pe)
            {
                return(View("Exception", pe));
            }
        }