VATNode Test API Lets Developers Build Without Using Live Quota

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VATNode offers a dedicated test API key, prefixed with 'vat_test_', that allows developers to build and test against its VAT validation API without consuming their monthly quota or writing to validation history. The test mode is triggered automatically by the key itself, requiring no changes to request URLs or body parameters. Developers must use VAT numbers starting with 'XX', a prefix reserved to avoid collisions with real EU member-state formats, with five specific numbers mapped to distinct response scenarios including valid lookups, missing company details, and upstream errors. Test responses mirror the same field names and data types as live responses, providing deterministic verdicts while generating fresh timestamps on each call. The only internal record kept is a one-time timestamp of a developer's first test call, used for onboarding purposes and not visible in the dashboard.

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