public override async void OnNavigatedTo(INavigationParameters parameters) //Est appelé avant l'affichage de la page
        {
            base.OnNavigatedTo(parameters);

            var    user = _authenticationService.AuthenticatedUser;
            string key  = await _secureStorageService.GetUserEncryptionKeyAsync(user);

            var decryptedCard = _cryptoService.Decrypt(user.CreditCard, key);

            _creditCard = decryptedCard;
        }