public async Task<ActionResult> ChangeCreditCard(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            var model = new CreditCardViewModel
            {
                CreditCard = await CardService.FindAsync(User.Identity.GetUserId(), id)
            };

            // If the card doesn't exist or doesn't belong the logged in user
            if (model.CreditCard == null || model.CreditCard.SaasEcomUserId != User.Identity.GetUserId())
            {
                return HttpNotFound();
            }
            model.CreditCard.ClearCreditCardDetails();

            return View(model);
        }
        public async Task<ActionResult> ChangeCreditCard(CreditCardViewModel model)
        {
            var userId = User.Identity.GetUserId();

            if (ModelState.IsValid && await CardService.CardBelongToUser(model.CreditCard.Id, userId))
            {
                var user = await UserManager.FindByIdAsync(userId);
                await CardService.UpdateAsync(user, model.CreditCard);
                
                // TempData.Add("flash", new FlashSuccessViewModel("Your credit card has been updated successfully."));
                
                return RedirectToAction("Index");
            }

            return View(model);
        }
        public async Task<ActionResult> AddCreditCard(CreditCardViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = await UserManager.FindByIdAsync(User.Identity.GetUserId());
                await CardService.AddAsync(user, model.CreditCard);

                // TempData.Add("flash", new FlashSuccessViewModel("Your credit card has been saved successfully."));

                return RedirectToAction("Index");
            }

            return View(model);
        }