What is a structured electronic invoice?
Understand why a PDF attachment alone is usually not a structured e-invoice and how machine-readable business terms enable automation.
Learning centre
Electronic invoicing guides
Understand the technical concepts behind country mandates and use them to design reliable invoice workflows, integrations and controls.
fundamentals
Core concepts
validation
Validation and data quality
XSD vs Schematron in invoice validation
Learn why valid XML can still fail business rules and how schema, Schematron and code lists work together.
The complete electronic invoice validation stack
A practical layered model covering file integrity, syntax, semantic rules, country rules, identity, security and authority acceptance.
Why invoice code lists cause validation errors
Understand currency, country, unit, payment-means, tax-category, exemption and endpoint-scheme code lists.
formats
File and document formats
identifiers
Identifiers and QR references
security
Security, signatures and privacy
Digital signatures in electronic invoices
Review XML signatures, certificate chains, revocation, signed properties and the difference between signature presence and trusted validity.
Privacy and browser-side invoice processing
Evaluate when local processing is possible and when secure temporary server processing is required for heavy validation or PDF work.
operations
Corrections, archiving and lifecycle
How to handle electronic invoice rejection codes
Build a repeatable process for preserving evidence, decoding rules, correcting data and safely resubmitting.
Electronic credit notes and invoice corrections
Understand preceding-invoice references, reason codes, line versus full corrections and authority-specific workflows.
Self-billing electronic invoices
Understand agreements, party roles, tax responsibility, profiles and recipient capabilities for self-issued supplier invoices.
Electronic invoice archiving and evidence
Plan immutable originals, readable copies, signatures, authority receipts, audit logs, retention and retrieval.
developers
API and integration engineering
Idempotency and duplicate prevention for invoice APIs
Prevent duplicate fiscal documents with stable document keys, idempotency tokens, response correlation and retry policies.
Secure webhook handling for invoice status events
Verify signatures, timestamps, replay protection and status transitions for asynchronous authority or provider webhooks.
Testing versus production e-invoicing environments
Separate sandbox credentials, test taxpayers, schema versions and non-production identifiers from legally valid issuance.
ERP-to-e-invoice field mapping method
Create a maintainable semantic map from ERP fields to invoice business terms, syntax paths, transformations and country extensions.
research
Country research
networks