public void Save(ShippingMethod shippingMethod)
{
throw new NotImplementedException();
}
public void SetShippingMethod(ShippingMethod shippingMethod)
{
if(ShippingContact == null)
throw new Exception($"Shipping method cannot be set before a shipping address has been set");
if(GetValidShippingMethods().FirstOrDefault(sm => sm.Code == shippingMethod.Code) == null)
throw new Exception($"Shipping method {shippingMethod.Code} is not valid for country {ShippingContact.Country}");
ShippingMethod = shippingMethod;
}