async void ButtonSubscribe_ClickedAsync(object sender, EventArgs e)
        {
            this.CustomActivityIndicator.IsRunning = true;
            string productDisclaimer;

            switch (Device.RuntimePlatform)
            {
            case Device.iOS:
                productDisclaimer = ViewModel.kAppleSubscriptionDisclaimer; break;

            case Device.Android:
                productDisclaimer = ViewModel.kAndroidSubscriptionDisclaimer; break;

            default:
                productDisclaimer = ""; break;
            }
            if (!ViewModel.User.IsSubscribed)
            {
                // needs subscribe to single first
                var product = await BillingManager.GetIAPBillingProductWithTypeAsync(EVeSubscriptionType.SingleSubscription);

                if (product.Success)
                {
                    var popupPage = new LabelButtonCancelPopupPage(StringSingleSubscription, "Subscribe now to get your 30 image slideshow of your very own photos! Images upload to your Tesla screen " +
                                                                   "in a matter of seconds directly from your mobile phone.\n\n", $"Pay {product.Product.LocalizedPrice}", productDisclaimer, "See Terms and Condition", 200)
                    {
                        PageDelegate = this
                    };
                    await Navigation.PushPopupAsync(popupPage);
                }
                else
                {
                    if (!String.IsNullOrEmpty(product.Message))
                    {
                        await DisplayAlert("Error", product.Message, "Ok");
                    }
                    else
                    {
                        await DisplayAlert("Error", "Oops, something went wrong. Please try again later.", "Ok");
                    }
                    return;
                }
            }
            else if (!ViewModel.User.HasMultipleSubscription)
            {
                // they already have single so they can opt for multiple
                var product = await BillingManager.GetIAPBillingProductWithTypeAsync(EVeSubscriptionType.AdditionalSubscription);

                if (product.Success)
                {
                    var popupPage = new LabelButtonCancelPopupPage(StringAdditionalSubscription, "Get 2 additional slideshows for your Tesla Screen! " +
                                                                   "Use additional slideshows for family, business, or specific events.\n\n" + productDisclaimer, $"Buy for {product.Product.LocalizedPrice}", "See Terms and Condition", productDisclaimer, 200)
                    {
                        PageDelegate = this
                    };
                    await Navigation.PushPopupAsync(popupPage);
                }
                else
                {
                    if (!String.IsNullOrEmpty(product.Message))
                    {
                        await DisplayAlert("Error", product.Message, "Ok");
                    }
                    else
                    {
                        await DisplayAlert("Error", "Oops, something went wrong. Please try again later.", "Ok");
                    }
                    return;
                }
            }
            else
            {
                // they already have both memberships
                await DisplayAlert("Subscription", "You already have full access", "Ok");
            }
            this.CustomActivityIndicator.IsRunning = false;
        }