{"id":"t/vat_de_validate","kind":"forged","name":"vat_de_validate","description":"Offline validator for a German VAT number (Umsatzsteuer-Identifikationsnummer, USt-IdNr). Checks the 'DE'+9-digit format and verifies the official modulus-11 checksum algorithm published by the German tax authority; returns validity and normalized number.","tags":["validator","germany","vat","tax-id","offline"],"method":"POST","path":"/v1/t/vat_de_validate","url":"https://toll402.dev/v1/t/vat_de_validate","specUrl":"https://toll402.dev/v1/spec/t/vat_de_validate","price":"$0.001","priceUsd":0.001,"available":true,"inputSchema":{"type":"object","properties":{"vat":{"type":"string","description":"German VAT number, e.g. 'DE811569869' or '811569869'"}},"required":["vat"],"additionalProperties":false},"example":{"vat":"DE811569869"},"meta":{"creator":null,"createdAt":"2026-09-09T20:28:18.263Z","calls":6,"failures":5,"network":false,"notes":"Offline validator: strips 'DE' prefix/formatting, checks 9-digit format, then applies Germany's official modulus-11 checksum algorithm (running product/remainder over first 8 digits) to verify the 9th check digit; no network calls used."}}