/// <summary>
/// The collection of <see cref="IInvoice"/> associated with the <see cref="IShipment"/>.
/// </summary>
/// <param name="shipment">
/// The <see cref="IShipment"/>.
/// </param>
/// <returns>
/// The <see cref="IEnumerable{IInvoice}"/>.
/// </returns>
public static IEnumerable <IInvoice> Invoices(this IShipment shipment)
{
return(shipment.Invoices(MerchelloContext.Current));
}