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Developer guides and compliance resources for EU VAT validation.
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.
Read articleVIES 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.
Read articleReverse charge sounds simple but the implementation details trip up most SaaS billing engineers. Here is what your system must do to stay compliant.
Read articleVatstack's free tier caps at 20 requests/month. TaxID starts at 100 free. Here is the full breakdown.
Read articleGerman USt-IdNr numbers follow DE + 9 digits. But format-valid numbers can still fail VIES. Here is everything a developer needs to know.
Read articleEU platforms with 30+ sellers or €2,000+ threshold must collect and validate seller tax IDs under DAC7. Here is the technical implementation.
Read article'Free' means different things. Vatlayer's free tier is HTTP only. Vatstack caps at 20 requests. The real comparison before you commit.
Read articleCopy-paste Node.js / TypeScript implementation for EU VAT validation with proper error handling, caching, and test coverage.
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