@ruegerth it’s done: international package tracking is out, here: Intégration externe - Suivi de colis international (17TRACK, DHL)
DHL and Deutsche Post go through DHL’s official API (free key to create on developer.dhl.com), and all other carriers, including Austrian and Swiss Post, go through 17TRACK (also free). La Poste, Colissimo, and Chronopost remain in this integration. I’m interested in your feedback, especially for Austrian and Swiss Post, which I couldn’t check one by one!