Spanish foreigner ID — letter prefix (X/Y/Z) + 7 digits + check letter.
NIE (Número de Identificación de Extranjero) — Spanish foreigner ID — letter prefix (X/Y/Z) + 7 digits + check letter.
Example: X1234567L
BIN lookup, card & data validation, fraud signals — one clean REST API. 500 requests/day free, no credit card required.