public ActionResult Post([FromBody] ApproveRequest req)
        {
            var uatpResp = new PayPalServiceModel().DoExpressCheckOutPaymentUATP(req.TokenId, req.PayerId);

            return(new JsonResult(uatpResp));
        }
        public ActionResult Get()
        {
            var service = new PayPalServiceModel();

            return(new JsonResult(service.SetExpressCheckOut()));
        }