PurchaseFacade.cs

public class PurchaseFacade
{
    public void PurchaseItemSalesTax(string itemUrl, string itemPrice, string taxAmount, ClientLoginInfo clientLoginInfo, ClientPurchaseInfo clientPurchaseInfo)
    {
        PurchaseItemInternal(itemUrl, clientLoginInfo, clientPurchaseInfo);
        PlaceOrderPage.Instance.Validate().EstimatedTaxPrice(taxAmount);
    }

    public void PurchaseItemGiftWrapping(string itemUrl, string itemPrice, string giftWrapTax, ClientLoginInfo clientLoginInfo, ClientPurchaseInfo clientPurchaseInfo)
    {
        PurchaseItemInternal(itemUrl, clientLoginInfo, clientPurchaseInfo);
        PlaceOrderPage.Instance.Validate().GiftWrapPrice(giftWrapTax);
    }

    public void PurchaseItemShippingTax(string itemUrl, string itemPrice, string shippingTax, ClientLoginInfo clientLoginInfo, ClientPurchaseInfo clientPurchaseInfo)
    {
        PurchaseItemInternal(itemUrl, clientLoginInfo, clientPurchaseInfo);
        PlaceOrderPage.Instance.Validate().ShippingTaxPrice(shippingTax);
    }

    private void PurchaseItemInternal(string itemUrl, ClientLoginInfo clientLoginInfo, ClientPurchaseInfo clientPurchaseInfo)
    {
        ItemPage.Instance.Navigate(itemUrl);
        ItemPage.Instance.ClickBuyNowButton();
        PreviewShoppingCartPage.Instance.ClickProceedToCheckoutButton();
        SignInPage.Instance.Login(clientLoginInfo.Email, clientLoginInfo.Password);
        ShippingAddressPage.Instance.FillShippingInfo(clientPurchaseInfo);
        ShippingAddressPage.Instance.ClickContinueButton();
        ShippingPaymentPage.Instance.ClickBottomContinueButton();
        ShippingPaymentPage.Instance.ClickTopContinueButton();
    }
}