Discover UA02 = Discover's CNP fraud code. Equivalent to Visa 10.4 or Mastercard 4837. ProtectBuy provides 3DS-equivalent authentication with liability shift. No CE 3.0 equivalent — identity-continuity data is persuasive but not mandatory. For merchants with meaningful Discover volume, a Discover-specific playbook recovers 5–10% more disputes than defaulting to Visa habits.
What UA02 covers
Discover UA02 is "Fraud — Card Not Present." Cardholder claims non-participation in a CNP transaction.
Discover's fraud reason code family:
- UA01: Fraud — Card Present
- UA02: Fraud — Card Not Present (ecommerce, MOTO)
- UA05: Fraud — Chip Card Counterfeit
- UA06: Fraud — Chip and PIN
UA02 is the code ecommerce merchants care about. Same category as Visa 10.4 and Mastercard 4837.
Response deadlines
Varies by sub-case:
- Standard first chargeback: 30 days from chargeback date
- Some fraud sub-cases: 20 days (tighter than Visa's 30)
- Pre-arbitration filing: 20 days from rejected representment
Check the specific dispute detail on your acquirer's interface. Discover doesn't have a single flat number the way Visa does.
Discover ProtectBuy
Discover ProtectBuy is Discover's 3-D Secure implementation. Equivalent to Visa Secure or Mastercard SecureCode. Same core mechanics:
- Merchant routes CNP transactions through ProtectBuy
- Discover's ACS decides frictionless approval or challenge
- Fully-authenticated transactions carry liability shift
ECI values for ProtectBuy match standard 3DS 2.0 spec — ECI 05 (frictionless) or ECI 06 (challenge) carry liability shift.
ProtectBuy adoption is lower than Visa Secure — many US ecommerce sites don't bother implementing it. For merchants with meaningful Discover traffic, ProtectBuy pays for itself the same way Visa Secure does.
Evidence stack
For UA02 representment:
- ProtectBuy authentication result — strongest single piece if used.
- AVS + CID match records — Discover uses CID (their name for CVV).
- Delivery to AVS-verified address — carrier tracking + POD.
- IP + device fingerprint — matched to prior successful transactions.
- Prior transaction history — persuasive but not binding (no CE 3.0 on Discover).
- Communication history — support tickets, post-purchase engagement.
Don't copy your Visa evidence packet 1:1. Discover uses CID (not CVV), ProtectBuy (not Visa Secure). Adjust terminology in the rebuttal narrative — issuers notice.
Frequently asked questions
What is Discover UA02?
Discover's CNP fraud reason code. Equivalent to Visa 10.4 or Mastercard 4837.
Does Discover have CE 3.0?
No. Discover doesn't have a mandatory-acceptance compelling-evidence rule. Identity-continuity data is persuasive but not binding on reviewers.
What is Discover ProtectBuy?
Discover's 3-D Secure implementation. Equivalent to Visa Secure or Mastercard SecureCode. Fully-authenticated transactions carry liability shift.
Post reflects public documentation, industry surveys, and Aurai's own book of disputes as of the publish date. Visa, Mastercard, American Express, Discover, Stripe, PayPal, and Shopify are trademarks of their respective owners; Aurai is independent and not endorsed by any of them. Network rules change — always verify current official rules before acting on any specific tactic.