About
Patrick Jerominek is a cofounder of BeeBack UG, building invoice-api.xhub — a REST API for e-invoicing (XRechnung, ZUGFeRD, Factur-X, Peppol). He focuses on developer tools and the technical side of the EU e-invoicing mandate, and writes about e-invoicing standards, API design, and GoBD/GDPR-compliant invoicing for developers.
Posts by Patrick Jerominek (7)
E-Invoicing Mandate 2025: n8n Automation for Small Businesses
Germany's e-invoicing mandate affects every business. How SMBs automate invoice creation for free with n8n and the xhub.io API — incl. ROI numbers.
Automatically Validate and Archive E-Invoices with n8n
Fully automated n8n workflow: receive e-invoices via email, auto-detect the format, validate and archive compliantly — with Slack error alerts.
Customize invoice templates via API: BlockTemplate tutorial
How to generate PDF invoices with logo, brand colors and dynamic VAT rows using JSON only. Incl. EN 16931 compliance and ZUGFeRD pitfalls.
Create XRechnung with n8n — Step-by-Step Tutorial
Learn how to automatically create XRechnung invoices with n8n and Invoice-api.xhub. From Google Sheets to validated XML — completely without coding.
Our Biggest Customer Is Ourselves: Dogfooding at xhub.io
invoice.xhub.io runs on the same API we offer developers. A dogfooding story about shared libraries, real validation and our own pitfalls.
E-Invoicing Mandate 2025: Complete Guide for Developers
E-invoicing becomes mandatory for B2B in 2025. Technical guide with code examples for XRechnung, ZUGFeRD, and Peppol. Implementation checklist included.
Automatically Validate E-Invoices with n8n
Automated invoice validation with n8n and Invoice-api.xhub: schema checks, error diagnosis and escalation — completely without code.