def notify_by(self, invoice_id, medium, **kwargs):
        """"
        Send/Resend notifications to customer via email/sms

        Args:
            invoice_id : Id for trigger notify
            medium : Medium for triggering notification via email or sms

        Returns:
            {"success": true}
        """
        url = "{}/{}/notify_by/{}".format(self.base_url, invoice_id, medium)
        return self.post_url(url, {}, **kwargs)