Hey James,

Add an event handler:

    /// <summary>
    /// Example shipment shipped / delivered notification handler
    /// </summary>
    /// <param name="sender">
    /// The sender.
    /// </param>
    /// <param name="e">
    /// The <see cref="StatusChangeEventArgs{IShipment}"/>
    /// </param>
    private void ShipmentServiceStatusChanged(IShipmentService sender, StatusChangeEventArgs<IShipment> e)
    {
        var validKeys = new[]
                        {
                            Core.Constants.DefaultKeys.ShipmentStatus.Delivered,
                            Core.Constants.DefaultKeys.ShipmentStatus.Shipped
                        };

        foreach (var shipment in e.StatusChangedEntities)
        {
            if (!validKeys.Contains(shipment.ShipmentStatus.Key)) continue;

            LogHelper.Info<UmbracoEventHandler>(string.Format("Raising notification trigger for shippment no. {0}", shipment.ShipmentNumber));

            Notification.Trigger("OrderShipped", shipment, Core.Observation.Topic.Notifications);
        }
    }

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