What Discover Reason Code UA21 Means
Discover reason code UA21, Fraud — Keyed, No Imprint, is filed when a cardholder disputes a card-present transaction that was manually keyed into the terminal without taking a physical card imprint. This is the highest-risk scenario for merchants: no chip read, no magnetic stripe swipe, and no physical imprint means no EMV liability shift and almost no available defense.
Keyed transactions bypass every physical card verification mechanism. The merchant accepted full fraud liability at the moment they chose to key the card number rather than process it through a chip or swipe. Without a physical imprint or signed authorization form, there is typically no way to prove the card was physically present.
UA21 is keyed-entry fraud with no physical imprint — the worst outcome for merchant liability. UA18 and UA20 cover EMV chip transactions that can qualify for liability shift. UA06 is CNP fraud with different evidence requirements.
Cross-Network Equivalent Codes
| Network | Code | Title | Notes |
|---|---|---|---|
| Discover | UA21 | Fraud – Keyed, No Imprint | This page |
| Visa | 10.5 | Visa Fraud Monitoring Program | Visa card-present fraud |
| Mastercard | 4870 | Chip Liability Shift | Mastercard EMV chip fraud |
| Amex | F24 | No Cardmember Authorization | Amex general fraud code |
Common Trigger Scenarios
- Card number keyed at POS when chip or swipe fails. Staff manually keys the card number after multiple chip or swipe failures, bypassing all physical card verification.
- Telephone order processed as card-present. A MOTO transaction is incorrectly coded as card-present and keyed without an imprint, combining two liability problems.
- Partial card data keyed from memory or notes. A staff member keys partial card information without the physical card present, creating a fraudulent card-present transaction record.
- Force-posted transactions. A transaction is forced through after a decline without proper authorization, and keyed without a physical imprint to document card presence.
- Terminal malfunction bypassed by manual entry. Staff key the card number to complete a sale when the terminal is malfunctioning, accepting full fraud liability in the process.
Key Deadlines & Timeframes
| Milestone | Timeframe | Notes |
|---|---|---|
| Cardholder Filing Window | 120 days | From the transaction date |
| Merchant Response Window | 30 days | From Discover dispute notification |
| Pre-Arbitration | 30 days | If Discover rejects representment |
Evidence You Will Need
- Written cardholder authorization form — a signed order form or authorization document showing the cardholder approved the transaction
- Physical card imprint — a carbon imprint of the physical card taken at the time of the transaction (rarely available but decisive if it exists)
- Cardholder signature on sales receipt — a signed receipt with the cardholder signature matching the card account
- Proof of card presence — any documentation showing the physical card was present, such as a copy of the card front and back
- Delivery or service confirmation — proof the goods or services were delivered to the cardholder at their billing address
Learn Exactly How to Package and Present This Evidence
The Fraud Defense Guide covers the evidence format for UA21 representments, what documentation can help, and when to accept the chargeback rather than fight it.
Learn exactly how to package and present this evidence →How Merchants Lose This Dispute
- No physical card evidence of any kind. With no imprint, no chip, and no swipe, there is no way to prove the card was physically present. This is almost always a losing dispute.
- No signed authorization. Without a written cardholder authorization or signed receipt, the representment has no documentary foundation.
- Delivery to a non-billing address. Shipping to an address other than billing further weakens an already very weak position.
- Pattern of keyed transactions. If the merchant regularly keys transactions, it signals systemic process failure, not an isolated incident, making dispute resolution harder.
Get the Step-by-Step Winning Strategy
Our Fraud Defense Guide covers the complete UA21 representment structure and what limited defenses exist for keyed-entry fraud.
Get the step-by-step winning strategy →Response Framework Overview
- Locate any written authorization — a signed order form or cardholder authorization document is the only viable defense evidence.
- Check for a signed sales receipt — cardholder signature on the transaction slip is supporting evidence if available.
- Document delivery to billing address — carrier tracking to the billing address is the strongest supporting evidence.
- Evaluate acceptance versus contestation — with no physical card evidence, calculate whether fighting the dispute is worth the cost.
Prevention Tips
- Never key card-present transactions without taking a physical imprint. If you must key a transaction, always take a physical imprint of the card as documentation.
- Require written cardholder authorization for all keyed transactions. A signed authorization form provides the only viable defense evidence for UA21 disputes.
- Train staff to use the chip or swipe, not manual entry. Keyed transactions should be an absolute last resort, not a convenience shortcut.
- Fix terminal issues rather than bypassing them. A malfunctioning terminal should be repaired, not bypassed by manual keying that exposes the business to full fraud liability.
Frequently Asked Questions
Can a merchant ever win a UA21 dispute?
Rarely, but yes — if the merchant has a signed cardholder authorization form, a physical card imprint, or a signed receipt with matching cardholder signature, a representment is possible. Without any physical documentation, acceptance is almost always the right decision.
Is there any difference between keyed card-present and CNP for dispute purposes?
Keyed without imprint falls under UA21 (card-present fraud). True CNP transactions like phone and online orders fall under different codes. The key difference is how the transaction was originally classified at the time of processing.
How long does a cardholder have to file a UA21 dispute?
120 days from the transaction date. The merchant response window is 30 days from Discover’s notification.