Invoice-api.xhub Blog

Insights, tutorials, and news about e-invoicing, API development, and the German compliance landscape.

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Our Biggest Customer Is Ourselves -- How invoice.xhub.io Runs on the Invoice API
FeaturedProduct

Our Biggest Customer Is Ourselves -- How invoice.xhub.io Runs on the Invoice API

invoice.xhub.io uses the same API we offer to developers. A dogfooding story about shared libraries, real validation, and why the best test is your own product.

Patrick Jerominek
February 12, 2026
8 min
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E-Invoicing Mandate 2025: Complete Guide for Developers
Compliance

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.

Patrick Jerominek
Patrick Jerominek
Jan 2015 min
Automatically Validate E-Invoices with n8n
Integration

Automatically Validate E-Invoices with n8n

Build an automated invoice validation system with n8n and Invoice-api.xhub. Schema validation, error diagnosis, and automatic escalation -- completely without code.

Patrick Jerominek
Patrick Jerominek
Jan 1510 min

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