The electronic invoice is already being used in international traffic. The cross-border transmission and processing of electronic invoices between Germany and France have been fully guaranteed since 24 March 2020 thanks to the complete technical synchronization of ZUGFeRD 2.1 and Factur-X 1.0.
At the European level, the European Commission is dealing with this issue. Germany is represented at the EU level by two representatives of FeRD in the so-called European Multi-Stakeholder Forum for e-invoicing, which brings together delegates from the national forums.
You can access the European Commission's website on electronic invoicing here.