One key: Turkish severance and VAT tables, identifier checksums, sanctions screening, address and e-invoice parsing, dated FX and fuel archives. Metered per call, cache hits free.
VIES wrappers that map a timeout to invalid charge VAT to a reverse-charge customer. We return unknown. Rates are a dated table (asOf), not a live register. Try without an account: https://api.temsor.com/docs