They provide me with an XML to download that information and convert it into a QR code that redirects to that information. For Odoo version 13, this code worked for me

from odoo import api, fields, models, tools, _

import io, base64, qrcode

from odoo.exceptions import UserError

import zipfile

from xml.dom.minidom import parseString

class QrCodeAccountMove(models.Model):

    _inherit = 'account.move'

    qr_code = fields.Binary("QR Code", attachment=True, store=True)

    def l10n_co_edi_download_electronic_invoice(self):

        invoice_download_msg, attachments = super(QrCodeAccountMove, self).l10n_co_edi_download_electronic_invoice()

        if attachments:

            with tools.osutil.tempdir() as file_dir:

                with zipfile.ZipFile(io.BytesIO(attachments[0][1])) as zip_ref:

                    zip_ref.extractall(file_dir)

                    xml_file = [f for f in listdir(file_dir) if f.endswith('.xml')]

                    if xml_file:

                        content = parseString(zip_ref.read(xml_file[0]))

                        uuid_element = content.getElementsByTagName('cbc:UUID')

                        description_element = content.getElementsByTagName('cbc:Description')

                        if uuid_element:

                            self.l10n_co_edi_cufe_cude_ref = uuid_element[0].childNodes[0].nodeValue

                        if description_element:

                            desc = description_element[0].childNodes[0].nodeValue

                            parsed_desc = parseString(desc)

                            tag_xml = parsed_desc.getElementsByTagName('cbc:Note')

                            if tag_xml and self.move_type == 'in_invoice':

                                qr_txt = tag_xml[1].childNodes[0].nodeValue

                                qr_lst = qr_txt.split()

                                text = self.split_text(qr_lst, 2)

                                self.generate_qr_code(text)

                            if tag_xml and self.move_type not in ['in_refund', 'in_invoice']:

                                qr_txt = tag_xml[9].childNodes[0].nodeValue

                                qr_lst = qr_txt.split()

                                text = self.split_text(qr_lst, 2)

                                self.generate_qr_code(text)

        return invoice_download_msg, attachments

    def split_text(self, arr, size):

        arrs = []

        while len(arr) > size:

            pice = arr[:size]

            arrs.append(pice)

            arr = arr[size:]

        arrs.append(arr)

        return '\n'.join([' '.join(chunk) for chunk in arrs])

    def generate_qr_code(self, text):

        qr = qrcode.QRCode(

            version=4,

            error_correction=qrcode.constants.ERROR_CORRECT_L,

            box_size=4,

            border=4,

        )

        qr.add_data(text)

        qr.make(fit=True)

        img = qr.make_image()

        temp = BytesIO()

        img.save(temp, format="PNG")

        qr_image = base64.b64encode(temp.getvalue())

        self.qr_code = qr_image.decode('utf-8')

I've tried to do the same for version 16, but I believe some functions or code have changed because I'm not able to generate a QR code, despite making several modifications.

I would be very grateful if you could help me with this problem. Thank you very much.