Opens a pdf of a credit note

        :param credit_note_it: the credit note id
        :return: dict

def credit_note_pdf(self, credit_note_it):
        """
        Opens a pdf of a credit note

        :param credit_note_it: the credit note id
        :return: dict
        """
        return self._create_get_request(resource=CREDIT_NOTES, billomat_id=credit_note_it, command=PDF)