I have this example based on demo store and latest version of Umbraco Commerce. It hit the

IUmbracoBuilder

extension, but strange enhough it doesn't seem to hit the event handlers or pipeline task, when updating order lines in cart. Anything obvious I am missing?

public static IUmbracoBuilder AddMyStore(this IUmbracoBuilder umbracoBuilder)
{
    umbracoBuilder.AddUmbracoCommerce(v =>
    {
        // Enable SQLite support
        //v.AddSQLite();

        // Replace the umbraco product name extractor with one that supports child variants
        //v.Services.AddUnique<IUmbracoProductNameExtractor, CompositeProductNameExtractor>();

        // Register event handlers
        v.WithNotificationEvent<OrderProductAddingNotification>()
            .RegisterHandler<OrderProductAddingHandler>();

        v.WithNotificationEvent<OrderLineChangingNotification>()
            .RegisterHandler<OrderLineChangingHandler>();

        v.WithNotificationEvent<OrderLineRemovingNotification>()
            .RegisterHandler<OrderLineRemovingHandler>();

        v.WithNotificationEvent<OrderPaymentCountryRegionChangingNotification>()
            .RegisterHandler<OrderPaymentCountryRegionChangingHandler>();

        v.WithNotificationEvent<OrderShippingCountryRegionChangingNotification>()
            .RegisterHandler<OrderShippingCountryRegionChangingHandler>();

        v.WithNotificationEvent<OrderShippingMethodChangingNotification>()
            .RegisterHandler<OrderShippingMethodChangingHandler>();

        v.WithCalculateOrderPipeline()
            .Add<ShoppingBagOrderCalculationPipelineTask>();
            //.InsertAfter<CalculateOrderSubtotalPriceWithoutAdjustmentsTask, ShoppingBagOrderCalculationPipelineTask>();
    });

    return umbracoBuilder;
}
`