Turkey Company Lookup API

Overview

Verify Turkish companies using their Tax Identification Number (VKN). Real-time data from GIB (Revenue Administration of Turkey). Bilingual support via ?lang=tr or ?lang=en.

Authentication

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Endpoints

GET /v1/company/vkn-lookup?vkn=1234567890

Queries GIB database in real-time. Returns company name, tax office, city, district, status.

{
  "vkn": "1234567890",
  "company_name": "ORNEK SIRKETI A.S.",
  "tax_office": "Beyoglu",
  "city": "Istanbul",
  "district": "Beyoglu",
  "status": "Active",
  "source": "GIB (Revenue Administration of Turkey)"
}

GET /v1/company/tax-offices?city=Istanbul

Lists tax offices filtered by city. Covers 10+ major cities.

{
  "city": "Istanbul",
  "tax_offices": ["Beyoglu", "Fatih", "Kadikoy", "Uskudar", "..."],
  "count": 30
}

GET /v1/company/vkn/generate-check?vkn=1234567890

Offline VKN format validation. Checks mathematical validity before database query.

Use Cases

E-invoice systems: Verify recipient before sending e-fatura
B2B onboarding: Validate trading partner identity
Accounting software: Auto-fill company info from VKN
KYC/AML: Compliance verification
Supplier verification: Verify before transactions

Note

VKN Lookup queries the official GIB server in real-time. Response times may vary (1-3 seconds) based on GIB server availability.

Support

support@turkapi.tr | https://turkapi.tr