Opens a pdf of a delivery note

        :param delivery_note_id: the delivery note id
        :return: dict

def delivery_note_pdf(self, delivery_note_id):
        """
        Opens a pdf of a delivery note

        :param delivery_note_id: the delivery note id
        :return: dict
        """
        return self._create_get_request(resource=DELIVERY_NOTES, billomat_id=delivery_note_id, command=PDF)