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ZUGFeRD E-Invoicing

Contact & Support

Applies to the ZUGFeRD platform at zugferd-invoice.attrian.de and the Stripe App “ZUGFeRD E-Invoicing”.

Contact support

  • Email: zugferd-support@brainwave-software.de
  • Availability: Mon–Fri 9:00–17:00 (CET/CEST); we usually reply within 2 business days. This is not a service-level commitment.
  • Languages: German and English

Please include your Stripe account ID (acct_…) and, if relevant, the invoice number. Never send passwords or API keys.

Data processing agreement (DPA / AVV)

If you process invoices containing your customers' personal data through the Service, the data processing agreement under Art. 28 GDPR applies. It forms part of the terms of service (section 10) and is concluded when you install the Stripe App or sign up. It includes the technical and organisational measures and the sub-processors listed below.

Countersigned copy: email zugferd-support@brainwave-software.de with your company name and Stripe account ID; we send it within 5 business days.

Sub-processors

We use the following sub-processors when processing data on behalf of our customers:

  • Hetzner Online GmbH, Industriestr. 25, 91710 Gunzenhausen, Germany – server hosting for the application, database and the object storage we operate ourselves; processing in its Nuremberg data centre (Germany).
  • Sendinblue SAS (Brevo), 106 boulevard Haussmann, 75008 Paris, France – email delivery of invoices, only if you enable email delivery; processing in the EU.
  • Cloudflare, Inc., 101 Townsend St, San Francisco, CA 94107, USA – reverse proxy and DDoS protection for all traffic; transfer to the USA based on the EU-US Data Privacy Framework (Art. 45 GDPR), with standard contractual clauses in addition.

Stripe and the PEPPOL access point you choose are not sub-processors, as you engage these services yourself. We announce changes to this list at least 30 days in advance.

Frequently asked questions

What does the app do?
It turns your Stripe invoices into e-invoices in ZUGFeRD/XRechnung format (EN 16931): a PDF/A-3 with embedded XML that is validated and stored in your account.
How do I get started?
Install “ZUGFeRD E-Invoicing” from the Stripe App Marketplace and open it in the Stripe Dashboard. Your account is created automatically; company name, address and tax ID are taken from your Stripe account and can be completed in the settings.
What does it cost?
Use is currently free of charge; new accounts can currently convert up to 10 invoices.
Where is my data stored?
The database and files are stored on servers of Hetzner Online GmbH in Nuremberg, Germany; traffic runs through Cloudflare's network. See the privacy policy for details.
Are invoices sent to my customers automatically?
Only if you enable email or PEPPOL delivery in the settings. Otherwise you download the files yourself.
Does the Service archive my invoices in an audit-proof way?
No. Statutory retention (e.g. § 147 AO, GoBD) is your responsibility. Download the generated files and archive them in your own system.
What happens when I uninstall?
Your account is deactivated and all sessions are ended. The data is kept for a reinstall until you ask support to delete it; we then delete it within 30 days.

Last updated: 11 November 2026