nested_if_else.rb

def print_shipping_label(order)
  if order.outstanding_payments?
    nil
  else
    if order.address_incomplete?
      order.send_address_reminder
    else
      if order.standard_shipping?
        order.print_standard_shipping_label
      else
        order.print_priority_shipping_lable
      end
    end
  end
end