Factur-X and Order-X: electronic invoicing and ordering standards
Factur-X and Order-X Python library
Factur-X is a Franco-German e-invoicing standard which complies with the European e-invoicing standard EN 16931. The Factur-X specifications are available on the FNFE-MPE website in English and French. The Factur-X standard is also called ZUGFeRD 2.2 in Germany.
The main feature of this Python library is to generate Factur-X invoices and Order-X orders from a regular PDF document and a Factur-X or Order-X compliant XML file.
This lib provides additionnal features such as:
extract the XML file from a Factur-X or Order-X PDF file,
check a Factur-X or Order-X XML file against the official XML Schema Definition.
Some of the features provided by this lib also work for ZUGFeRD 1.0 (the ancestor of the Factur-X standard).
To install it on Linux, run:
sudo pip3 install --upgrade factur-x
from facturx import generate_from_file generate_from_file(regular_pdf_file, xml_file)
The PDF file regular_pdf_file will be updated to Factur-X/Order-X. If you want to write the resulting Factur-X/Order-X PDF to another file, use the argument output_pdf_file.
To have more examples, look at the docstrings in the source code or look at the source code of the command line tools located in the bin subdirectory.
Command line tools
Several command line tools are provided with this lib:
facturx-pdfgen: generate a Factur-X or Order-X PDF file from a regular PDF file and an XML file
facturx-pdfextractxml: extract the XML file from a Factur-X or Order-X PDF file
facturx-xmlcheck: check a Factur-X or Order-X XML file against the official XML Schema Definition
All these commande line tools have a –help option that explains how to use them and shows all the available options.
Tutorial: generate a Factur-X invoice under Windows
Download the last version of Python for Windows from python.org/downloads.
Launch the installer. On the first screen of the installer, enable the option Add python.exe to PATH. At the end of the installation process, the installer displays a screen with the message Setup was successful ; at that step, it may propose you Disable path length limit with a help message that says Changes your machine configuration to allow programs, including Python, to bypass the 260 character “MAX_PATH” limitation. You must accept this proposal (otherwise the installation of the factur-x library will fail): click on the label Disable path length limit and follow the instructions.
Open a Windows command prompt as Administrator and enter the following command to download and install the factur-x library:
pip3 install --upgrade factur-x
Look at the installation logs and make sure there are no error messages. Close the Windows command prompt.
Open a new Windows command prompt (not as Administrator) and enter the following command (adapt the path to your filesystem):
python C:\Users\Alexis\AppData\Local\Programs\Python\Python311\Scripts\facturx-pdfgen --help
It should display the help of the command facturx-pdfgen.
Enter the following command to generate a Factur-X invoice:
python C:\Users\Alexis\AppData\Local\Programs\Python\Python311\Scripts\facturx-pdfgen C:\Users\Alexis\Documents\invoice.pdf C:\Users\Alexis\Documents\fx.xml C:\Users\Alexis\Documents\invoice-facturx.pdf
C:\Users\Alexis\Documents\invoice.pdf is the original PDF invoice,
C:\Users\Alexis\Documents\fx.xml is the Factur-X XML file,
C:\Users\Alexis\Documents\invoice-facturx.pdf is the Factur-X PDF invoice that will be generated.
This project also provides a webservice to generate a Factur-X or Order-X PDF file from a regular PDF file, the XML file and additional attachments (if any). This webservice uses Flask. To run the webservice, run facturx-webservice available in the bin subdirectory of the project. To query the webservice, you must send an HTTP POST request in multipart/form-data using the following keys:
pdf -> PDF file (required)
xml -> Factur-X or Order-X file (any profile, required)
attachment1 -> First attachment (optional)
attachment2 -> Second attachment (optional)
To deploy this webservice in production, follow the guidelines of the official Flask documentation: you should use a WSGI server (such as Gunicorn) and a reverse proxy (such as Nginx or Apache). You will certainly have to increase the default maximum upload size (default value is only 1MB under Nginx!): use the parameter client_max_body_size for Nginx and LimitRequestBody for Apache.
I recommend this tutorial (in French) which explains how to deploy a Flask application with Gunicorn and Nginx on Ubuntu.
You can use curl, a command line tool to send HTTP requests (on Linux Ubuntu/Debian, just install the curl package) to generate the request:
curl -X POST -F 'pdf=@/home/me/regular_invoice.pdf' -F 'xml=@/home/me/factur-x.xml' -F 'attachment1=@/home/me/delivery_note.pdf' -o /home/me/facturx_invoice.pdf https://ws.fnfe-mpe.org/generate_facturx
A public instance of this webservice is available on a server of FNFE-MPE at the URL https://ws.fnfe-mpe.org/generate_facturx.
This library is published under the BSD licence (same licence as pypdf on which this lib depends).
Alexis de Lattre <email@example.com>
Version 3.1 dated 2023-08-13
Keep bookmarks, annotations, etc. from input PDF file. For that, we use the method clone_document_from_reader() of pypdf instead of append_pages_from_reader()
Fix bug on xml type parsing (bug introduced in version 3.0)
raise explicit error when trying to generate a ZUGFeRD 1.x PDF invoice
Version 3.0 dated 2023-08-13
Replace dependency on PyPDF4 by pypdf. The development focus is back on pypdf and the forks PyPDF2, PyPDF3 and PyPDF4 are not maintained any more, cf this article.
Remove support for Python 2.7
In the scripts, replace /usr/bin/python3 by /usr/bin/env python
Version 2.5 dated 2023-03-24
Add support for ZUGFeRD 1.0 in get_level()
xml_check_xsd(): avoid warning Use specific ‘len(elem)’ or ‘elem is not None’ test instead.
Version 2.4 dated 2023-03-13
Update Factur-X XSD of all profiles to version 1.0.6
Update Order-X XSD of all profiles to version 1.0.0
Version 2.3 dated 2021-04-12
Fix wrong flavor argument passed by generate_facturx_from_file() to generate_from_file()
Version 2.2 dated 2021-04-08
Make method generate_from_binary() accessible via the lib
Version 2.1 dated 2021-04-07
Update Order-X XSD to the latest version provided to me by FNFE-MPE
Version 2.0 dated 2021-04-04
Add support for Order-X. This implies several changes:
method check_facturx_xsd() deprecated in favor of the new method xml_check_xsd() but still operates with a warning
method get_facturx_flavor() deprecated in favor of the new method get_flavor() but still operates with a warning
method generate_facturx_from_binary() deprecated in favor of the new method generate_from_binary() but still operates with a warning
method generate_facturx_from_file() deprecated in favor of the new method generate_from_file() but still operates with a warning
new optional argument orderx_type for methods generate_from_file() and generate_from_binary() with default value autodetect
new method get_orderx_type() to get the Order-X type (order, order change or order response)
new method get_xml_from_pdf() that work both on Factur-X and Order-X (the method get_facturx_xml_from_pdf() still exists and only operates on Factur-X)
Add lang argument to methods generate_from_file() and generate_from_binary() to set the lang of the PDF. This is one of the requirements for PDF accessibility, which is important for people with disabilities: it allows PDF speech synthesizers for blind people to choose the right language.
Add ability to choose the AFRelationship PDF property for the Factur-X/Order-X XML file and also for the additionnal attachments:
new argument afrelationship for methods generate_from_file() and generate_from_binary()
new key afrelationship for the attachments dict as argument of generate_from_file() and generate_from_binary()
Argument additional_attachments was deprecated in method generate_facturx_from_file() in version 1.8: it doesn’t operate any more and only displays a warning.
Replace the optparse lib by the argparse lib in scripts.
Version 1.12 dated 2020-07-16
Compress attachments and XMP metadata using Flate compression
Version 1.11 dated 2020-05-11
Fix crash UnicodeEncodeError on Python 2.7
Version 1.10 dated 2020-04-14
Update XSD of all profiles to Factur-X version 1.0.5
Version 1.9 dated 2020-02-11
Improve Python3 support in get_facturx_xml_from_pdf()
Version 1.8 dated 2020-01-16
New tool facturx-webservice which implements a REST webservice using Flask to generate a Factur-X PDF invoice via a simple POST request.
New argument ‘attachments’ for generate_facturx_from_file() which replaces argument additional_attachments:
Possibility to set a filename for the attachment different from filename of the filepath
Possibility to set creation dates for attachments
Update script facturx-pdfgen to use the new attachments argument
Version 1.7 dated 2020-01-13
Fix bug in release 1.6 in XMP: variables were not replaced by their real value
Version 1.6 dated 2020-01-09
Generate XMP (XML-based PDF metadata) via string replacement instead of using XML lib
Version 1.5 dated 2019-11-13
Fix bug in generate_facturx_from_file() when using argument additional_attachments
Version 1.4 dated 2019-07-24
Update Factur-X XSD to the final version of Factur-X v1.0.04
Support XML extraction with ZUGFeRD invoices using ‘zugferd-invoice.xml’ filename (instead of the filename ‘ZUGFeRD-invoice.xml’ specified by the standard)
Version 1.3 dated 2019-06-12
Add XSD files for Extended profile in the Python package
Version 1.2 dated 2019-06-12
add support for the Extended profile
validate XML for Minimum and Basic WL profiles with the XSD of profile EN 16931, as asked by Cyrille Sautereau
minor improvements in the code for /Kids
Version 1.1 dated 2019-04-22
Improve support for embedded files extraction by adding support for /Kids
Version 1.0 dated 2019-01-26
Use PyPDF4 instead of PyPDF2, because there are no new releases of PyPDF2 since May 2016 (cf https://github.com/mstamy2/PyPDF2/wiki/State-of-PyPDF2-and-Future-Plans), and we need a recent version of PyPDF2 to be able to generate fully compliant PDF/A-3 files.
Version 0.9 dated 2019-01-25
Port to python 3 contributed by JoshuaJan (https://github.com/joshuajan)
Fix path to ZUGFeRD 1.0 XSD
Version 0.8 dated 2018-06-10
Make pretty_print work for XMP file, for better readability of that file
Version 0.7 dated 2018-05-24
Fix XMP structure under /x:xmpmeta/rdf:RDF/rdf:Description (use XML tags instead of XML attributes)
declare PDF-1.6 instead of PDF-1.3 (still declared by default by pyPDF2)
Version 0.6 dated 2018-05-01
Now fully PDF/A-3 compliant with additionnal attachments (tested with veraPDF)
facturx-pdfgen: don’t overwrite by default and add –overwrite option
Add factur-x library version number in metadata creator entry
Version 0.5 dated 2018-03-29
Fix XMP metadata structure
Now fully PDF/A-3 compliant when the input PDF file is PDF/A compliant (tested with veraPDF). This implied copying /OutputIntents and /ID datas from source PDF to Factur-X PDF.
Fix support for additionnal attachments: they can now all be saved with Acrobat Reader
Improve XML extraction from PDF Factur-x file
Version 0.4 dated 2018-03-27
Factur-x specs say /AFRelationship must be /Data (and not /Alternative)
Update Factur-X XSD to v1.0 final
Add support for additionnal attachments
Add factur-x lib version in Creator metadata table
Add /PageMode = /UseAttachments, so that the attachments are displayed by default when opening Factur-X PDF invoice with Acrobat Reader
Improve and enrich PDF objects (ModDate, CheckSum, Size)
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