Change Card PIN

Currently unavailable. This endpoint returns an error by design: cardholders must use an ATM to change their PIN. Kept in this collection for completeness; do not build against it yet — ask us before relying on it.

Path: cardId (string, required).

Body (JSON): oldPin (string, required), newPin (string, required).

Always fails: after the presence check the endpoint returns 400 with the ATM message below. No success response exists today.

All errors from this folder use { "status": "error", "message": "..." } and are returned as HTTP 400 (including “Card not found” — there is no 404). Success bodies use status: "success" (not success: true like the VTU endpoints).