Amex Reason Code F10: Missing Imprint

What Amex reason code F10 means

F10 is a card-present fraud code. The Card Member says they didn’t take part in the charge, and you can’t show that the physical card was there. The classic trigger is a manually keyed transaction at a terminal: the chip or stripe couldn’t be read (or the clerk skipped it), the number was typed in, and no imprint of the card was taken.

An “imprint” here means proof the card was physically present, traditionally a manual imprinter slip, or an electronic read of the card.

For online stores, F10 is mostly irrelevant. Card-not-present fraud on an online order comes through as F29 instead.

Common causes

• Damaged chips or stripes leading staff to key in the card number
• Pop-up, event or mobile sellers using keyed entry on a phone app
• Fraudsters with a card number but no physical card persuading staff to type it in
• Staff training gaps around fallback procedures

Evidence that wins an F10 dispute

1. An imprint of the card for the transaction, if one was taken.
2. Terminal or gateway data showing the card was actually read (chip, contactless or swipe) rather than keyed.
3. Signed or PIN-verified receipt, where your market still uses one.
4. Other proof of participation: CCTV, loyalty-account use at the same time, delivery or pickup records tied to the Card Member.

Without an imprint or a card read, F10 is hard to defend.

When keyed entry is unavoidable

If a card can’t be read and you still need to complete the sale in person, follow your acquirer’s fallback procedure, which may include taking an imprint, checking ID, and recording the card security code. Keep that documentation with the transaction record so you can produce it if an inquiry arrives.

How to prevent F10 disputes

• Always use the chip, tap or swipe when the card is present.
• Replace terminals and readers that fail frequently, so staff aren’t tempted to key in.
• Train staff that keyed entry on a present card needs an imprint where required, and that a customer who “only has the number” is a red flag.
• Check the American Express Merchant Regulations for your market’s current requirements, as procedures vary.

Should you fight or accept?

Fight only if you have an imprint, terminal data showing the card was read, or strong independent evidence the Card Member was there.

Accept when the transaction was keyed with no imprint. That’s exactly the scenario F10 assigns to the merchant.