public IActionResult Receivers()
        {
            var model = new ReceiversModel();

            model.Allowed = _pushNotificationsService.GetAllowedReceivers();
            model.Denied  = _pushNotificationsService.GetDeniedReceivers();

            return(View(model));
        }
        public async Task <IActionResult> Receivers()
        {
            var model = new ReceiversModel
            {
                Allowed = await _pushNotificationsService.GetAllowedReceivers(),
                Denied  = await _pushNotificationsService.GetDeniedReceivers()
            };

            return(View(model));
        }