Card validation API (Luhn + brand)

Validates card numbers via Luhn + IIN prefix and detects the brand. Responses contain only masked/last4 — never the raw PAN. No authorization or existence checks.

Endpoint

MethodPath
GET/api/v1/card/validate

Example

curl "https://formfit.dev/api/v1/card/validate?number=4242424242424242" \
  -H "Authorization: Bearer YOUR_API_KEY"

Response (excerpt)

{"valid":true,"brand":"visa","last4":"4242","masked":"•••• •••• •••• 4242"}

FAQ

Is the card number stored?
No — the raw PAN is never echoed or logged; validation is pure in-worker logic.

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