def METHOD_NAME(self):
    messages = super().METHOD_NAME()
    if not self.tx:
        return
    delta = self.tx.get_fee() - self.old_tx.get_fee()
    if not self.is_decrease_payment():
        msg = _("You will pay {} more.").format(self.main_window.format_amount_and_units(delta))
    else:
        msg = _("The recipient will receive {} less.").format(self.main_window.format_amount_and_units(delta))
    messages.insert(0, msg)
    return messages