Try it out calls are sent from your own browser straight to http://localhost:8888 — they only work if XPOS ESDC is installed and running on this same computer, with a smart card inserted in its reader. This page never sees your data.

⚠️ A card carries a real fiscal identity. Signing with a production card creates a real tax liability with your Tax Authority — only ever test against a sandbox card. If you don't have one, ask your tax authority to issue you a sandbox card before you start integrating, or use the DevESDC provided on the TaxCore Developer Portal.