Discover · Chargeback reason codes
Discover 4866 chargeback: Fraud Chip Card Counterfeit explained
Checked
Discover reason code 4866, Fraud Chip Card Counterfeit Transaction (older letter code UA05), means a counterfeit copy of a chip card was used in person and the chip was not read, in a region with a chip liability shift. Fiserv's guide gives the issuer 120 days. Answer with proof the terminal was chip-capable, the card was chip-read and authorized online, or a technical fallback was approved by the issuer.
- Category
- Fraud (card present)
- Time limit for the bank to file
- 120 calendar days from the processing date for most Discover codes (Fiserv guide, 2016)
- Time limit to respond
- Your processor's deadline: Stripe says usually 7–21 days depending on the network; Adyen gives 25 days for Discover
- Typical evidence
- Proof of a chip-capable terminal or chip read
- Can it be prevented?
- Yes: chip terminals that read the chip
- Who usually wins
- The merchant if the chip was read
What PlatformDTC does
PlatformDTC's in-store point of sale sends every card payment to a Stripe Terminal card reader on the store's own Stripe account; the till cannot key a card number in, and online orders are card-not-present. Online orders cannot receive a 4866.
What it means
A counterfeit card was used where both issuer and acquirer are in a chip liability shift region, and the chip was not read.
Older Discover documentation pairs 4866 with the letter code UA05.
Why customers file it
Skimmed card data on a counterfeit stripe card.
Evidence that wins
Respond to every Discover chargeback, even small ones, as Discover itself advises. Send:
- Proof the terminal is chip-capable
- Proof it was a chip card authorized online
- Proof of an issuer-approved technical fallback
How to prevent it
- Use chip terminals and always read the chip
For developers
On Stripe the dispute object arrives with reason "fraudulent" and the card network's own code in payment_method_details.card.network_reason_code; listen for charge.dispute.created and read evidence_details.due_by for the deadline.
Discover does not publish its dispute rules publicly; the codes and names here are the ones Stripe reports, and the defences come from processor guides.
Frequently asked questions
- Can an online order get a 4866?
- No. It requires a counterfeit card used in person.
- Is it defendable through Adyen?
- Adyen marks 4866 as not defendable through Adyen.
Sources
- Dispute categories and network reason codes — Stripe
- Dispute Management Guide, Discover chapter (Rev 04/16) — First Data (Fiserv)
- Dispute reason codes: Discover — Adyen
Related
- 4867 — A lost or stolen chip-and-PIN card was used where chip and PIN were not used.
- 7010 — The cardholder denies an in-person purchase.
- 4752 — The cardholder does not recognize the charge on their statement.
- 4755 — The cardholder says the goods or services never arrived.
- 4553 — The cardholder says the goods or services were defective, not as described or poor quality.
- 4541 — The cardholder says a recurring charge was billed after they cancelled.
- 8002 — The cardholder says a refund they were owed was never processed.