public async Task <IActionResult> GetToken([FromBody] AppointmentModel model)
        {
            var appointment = await _manager.GetAppointmentDetails(model.AppointmentId);

            var    tokBoxSetting = ConfigurationManager.AppSetting.TokBoxVideoSetting;
            var    OT            = new OpenTok(tokBoxSetting.APIKEY, tokBoxSetting.APISecret);
            string token         = OT.GenerateToken(appointment.RoomSID);

            return(Ok(new JObject
            {
                ["SessionId"] = model.RoomSID,
                ["AccessToken"] = token
            }.ToString()));
        }