generateDynamicCvvFromKey

generateDynamicCvvFromKey(
pan: string,
expiry: string,
atc: number,
derivedKey: Buffer,
keyId: string,
): string

Source: cvv.ts:177

Generates an EMVCo-style dynamic CVV using a pre-derived HMAC key. Binds an Application Transaction Counter (ATC) to the cryptogram.

Parameters

pan (string) — 16-digit PAN string
expiry (string) — "MM/YY" formatted expiry string
atc (number) — Application Transaction Counter (integer)
derivedKey (Buffer) — 32-byte key from deriveHmacKey()
keyId (string) — Key identifier. Default: DEFAULT_KEY_ID

Returns

string