# Invoice Navigator

> EU e-invoice compliance API. Validates, remediates, and revalidates electronic invoices against EN 16931, Peppol, XRechnung, Factur-X, ZUGFeRD, and 27 EU country-specific rule sets.

Invoice Navigator is NOT just a validator — it's a pre-submission compliance gate for ERP vendors and invoice pipelines. It auto-fixes structural errors while blocking changes to financial fields (amounts, VAT, IBANs). Every invoice gets a KoSIT revalidation loop and a timestamped Evidence Pack.

## Key Pages

- [API Documentation](https://www.invoicenavigator.eu/developers): REST API for production integration — validate, remediate, revalidate
- [API Authentication](https://www.invoicenavigator.eu/developers/authentication): API key management and auth flows
- [API Sandbox](https://www.invoicenavigator.eu/developers/sandbox): Test mode with sample invoices
- [Error Library](https://www.invoicenavigator.eu/errors): 1,300+ validation rules with fix classification (auto-fix, input-required, blocked)
- [E-Invoice Validator](https://www.invoicenavigator.eu/validator): Free online tool — upload and validate Peppol, XRechnung, Factur-X invoices
- [Format Converter](https://www.invoicenavigator.eu/convert): Convert between UBL, CII, Factur-X, ZUGFeRD
- [E-Invoicing Deadlines](https://www.invoicenavigator.eu/deadlines): Complete EU mandate timeline 2025-2030
- [ViDA Compliance Guide](https://www.invoicenavigator.eu/vida): EU VAT in the Digital Age regulation explained
- [Pricing](https://www.invoicenavigator.eu/pricing): Free unlimited validation (no account). Pay-as-you-go from EUR 7.90 per certified Evidence Pack download (single, 5-pack EUR 29, 20-pack EUR 79).

## Supported Formats

- UBL 2.1 (Universal Business Language)
- CII D16B (Cross Industry Invoice)
- Peppol BIS Billing 3.0
- XRechnung 3.0 (Germany)
- Factur-X / ZUGFeRD 2.1+ (France/Germany hybrid)
- FatturaPA (Italy)
- Country-specific CIUS variants for 27 EU member states

## Learning Resources

- [What is Peppol](https://www.invoicenavigator.eu/learn/peppol): Complete Peppol network guide
- [What is XRechnung](https://www.invoicenavigator.eu/learn/xrechnung): German e-invoicing standard explained
- [What is ZUGFeRD](https://www.invoicenavigator.eu/learn/zugferd): Hybrid PDF/XML format guide
- [What is EN 16931](https://www.invoicenavigator.eu/learn/en16931): European e-invoicing standard
- [UBL vs CII Comparison](https://www.invoicenavigator.eu/compare/ubl-vs-cii): Format differences explained

## Country Guides

27 EU country guides with mandate status, accepted formats, deadlines, and technical specs:
- [Germany](https://www.invoicenavigator.eu/country/germany), [France](https://www.invoicenavigator.eu/country/france), [Italy](https://www.invoicenavigator.eu/country/italy), [Belgium](https://www.invoicenavigator.eu/country/belgium), [Netherlands](https://www.invoicenavigator.eu/country/netherlands), [Spain](https://www.invoicenavigator.eu/country/spain), [Poland](https://www.invoicenavigator.eu/country/poland), [Austria](https://www.invoicenavigator.eu/country/austria), and 19 more at [/countries](https://www.invoicenavigator.eu/countries).

## Unique Capabilities

- **Safe Auto-Fix**: Structural corrections where commercial meaning is unchanged
- **Financial Field Blocking**: Amounts, VAT totals, IBANs are never modified
- **Input-Required Workflow**: Missing business data triggers explicit input, never assumptions
- **KoSIT Revalidation Loop**: Every remediated invoice is validated again before release
- **Evidence Pack**: Timestamped, tamper-evident compliance certificate per invoice
- **1,300+ Validation Rules**: Across EN 16931, Peppol, and 27 country-specific rule sets

## Technical Details

- REST API with JSON responses
- SDKs: TypeScript/Node.js (npm), Python (pip)
- Hosted in EU (GDPR compliant)
- Average response time: <500ms per invoice
- Webhook support for async processing

## Full Knowledge Base

For a comprehensive version of this document including all glossary terms, country guides, error definitions, and learning resources, see:
- Markdown: https://www.invoicenavigator.eu/llms-full.txt
- Structured JSON: https://www.invoicenavigator.eu/knowledge.json

## Company

Invoice Navigator is built by CCC Impact BV in Apeldoorn, Netherlands. Contact: hello@invoicenavigator.eu