# Adyen: Missing 3DS2 fingerprint (Checkout 14_0402)

**TL;DR:** After /payments returns IdentifyShopper, you must run the device fingerprint and send threeds2.fingerprint in the /payments/details call. Skipping straight to authorisation, or sending details without the fingerprint field, gives 14_0402.

```text
14_0402 - Missing 3DS2 fingerprint
```

## Steps

1. **Handle the IdentifyShopper action.** When /payments returns resultCode IdentifyShopper with a threeDS2 action, run the fingerprint step through the SDK or your 3DS2 implementation. Dont skip it.
   - *Success check:* the fingerprint step executes and returns fingerprint data.
2. **Include threeds2.fingerprint in /payments/details.** Send the fingerprint data plus the paymentData from the action response.
   - *Success check:* the details payload contains the threeds2.fingerprint field.
3. **Check the response.** You should get ChallengeShopper (continue to the challenge) or a frictionless authorisation, not 14_0402.
   - *Success check:* no 14_0402; the flow advances.

## When to use this

- /payments/details fails with 14_0402 after an IdentifyShopper step.
- A custom 3DS2 integration that authorises without doing the fingerprint.

## When NOT to use this

- 14_033 (the provided fingerprint is invalid). That means you sent a fingerprint and it was rejected, which is a data problem, not a missing step.
- 14_032 (provide either threeds2.fingerprint or threeds2.challengeResult). That is about sending the wrong field for the step.

## Compatibility

Adyen Checkout API 3DS2 native flows, Web/iOS/Android.

## Why it happens

The 3DS2 protocol requires the device fingerprint before the issuer decides on frictionless vs challenge. Adyen enforces the sequence: no fingerprint data in the details call, no onward flow.

## Edge cases

- If the 3DS method notification never arrives within 10 seconds, set threeDSCompInd to N and continue; the fingerprint can still complete.
- Some test cards skip fingerprinting. If your test never hits IdentifyShopper, use a card that triggers it.