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Developer guides and compliance resources for EU VAT validation.

ComplianceMay 11, 202615 min read

EU VAT Number Validation: The Complete Developer Guide (2026)

VIES is SOAP-based, unreliable, and has no caching. This guide explains how EU VAT validation works end-to-end, how to handle downtime gracefully, and includes copy-paste code examples in four languages.

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TutorialMay 18, 202612 min read

VIES Downtime: How to Build a Resilient VAT Validation Flow

VIES has scheduled and unscheduled maintenance windows. An API that hard-fails when VIES is down will block legitimate customers with valid numbers. Here is how to build a resilient flow.

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