Calculate order grand total

Order grand total is calculated in the pricing rules plugins.

Call following two methods to correctly calculate all the order total fields, and prepare the order to collect the payment.

using Litium.Foundation.Modules.CMS.GUI.Templates;
using System;
using Litium.Foundation.Modules;
using Litium.Foundation.Modules.ECommerce;
using Litium.Foundation.Modules.CMS;

public partial class Site_Samples_ECommerce_CheckoutCalculateOrderTotals : BaseTemplate
{
    void CalculateOrderTotals()
    {
            //recalculate the basket.
            Module<ModuleECommerce>.Instance.Orders.CalculateOrderTotals(CurrentState.Current.ShoppingCart.OrderCarrier, CurrentState.Current.Token);
        
            //add the payment amounts to collect from user to Paymentinfo object
            Module<ModuleECommerce>.Instance.Orders.CalculatePaymentInfoAmounts(CurrentState.Current.ShoppingCart.OrderCarrier, CurrentState.Current.Token);
    }
}

You should consider calling the CalculateOrderTotals when ever the end customer performs and operation that affects the order grand total. So that the end customer always see the updated values.

Note that, its not just adding or removing products from shopping cart that will affect order grand total. For example, when the customers login information changes, the customer might belong to a special user group, for which special pricelists or campaigns are applicable, which in turn would affect the grand total.