App features

• import PDF file(s). Examples can be found db/fixtures/factur-x/
• generate Invoice objects from attached PDF files
• parse PDF files to extract XML
• parse XML to get required data

Run app

bundle
rails db:create db:migrate
rails s

Theoretical notes

ZUGFeRD combines structured data with a visual PDF, while XRechnung relies exclusively on structured data.

PDF/A-3: PDF with embedded XML - human and machine readable

match incoming invoice with purchase order => pay

The CEN (European Committee for Standardization) has done this and produced the European Semantic Standard for electronic invoicing (EN 16931).

SIREN FR = NIP PL

credit note VS invoice?

"The presence of a specific PDF/A XMP extension scheme to describe the document as a Factur-X invoice corresponding to this specification, as well as the corresponding XMP metadata."

5.3. 2 differences in the use of Factur-X between France and Germany

6.2.2 ideally data relationship type should be Alternative (XML is the alternative to PDF)

The invoice might be not the only file embedded in the PDF!

Useful links

• https://xrechnungsgenerator.nortal.com/
• https://github.com/itplr-kosit/xrechnung-testsuite
• https://www.ferd-net.de/standards/zugferd-2.2/zugferd-2.2.html?acceptCookie=1
• https://github.com/excid3/receipts