What this validator checks for Factur-X / ZUGFeRD
- PDF attachment extraction (FlateDecode streams)
- Guideline ID detection for every profile
- Notice when MINIMUM / BASIC WL is not a full e-invoice
- EN 16931 business and calculation rules
- Party identifiers and VAT registrations
Hybrid invoices
A hybrid invoice lets the recipient read a PDF while software reads the XML. The XML is the legally relevant part. If your PDF generator embeds the wrong profile, the invoice may be rejected — InvoiceVerify shows the profile prominently.