Reason code · American Express
Amex F30: EMV counterfeit
F30 means the Card Member denies the charge and a counterfeit chip card was used where the sale wasn’t processed as a chip transaction, because the terminal couldn’t read chips or the card was keyed. It’s a liability-shift code: the fix is at the counter.
What F30 means
F30 is a chip-card liability code. EMV is the chip standard on modern cards. Amex’s guide describes F30 this way: the Card Member denies the charge, and a counterfeit chip card was used at a terminal where the sale wasn’t processed as a chip transaction, either because the terminal couldn’t process chips or because the sale was keyed in by hand.
Amex’s guide says F30 doesn’t apply to contactless transactions or digital wallet payments.
What happened
Someone copied the card’s data onto a fake card, and your terminal accepted it without using the chip. The real Card Member sees a charge they never made.
Time limit
Amex’s guide gives Card Members (Amex’s word for cardholders) up to 120 days from the transaction date to dispute most charges, and processor guides list this fraud code at the same 120 days.
Your side of the clock is short. Amex’s own guide tells merchants to respond within 20 days. If you accept Amex through a processor such as Stripe or Square, the processor sets its own date, often a shorter one. The due date on your notice is the one that counts.
What proof matters
Amex’s guide lists three answers: proof the charge was actually card-not-present, proof your terminal processed it as a chip transaction, or proof a refund already offsets it. That’s it. A signed receipt or a description of the customer doesn’t appear on the list.
This is a hardware problem, not an argument
Liability-shift codes reward whoever supported the chip. If the card had a chip and your terminal didn’t use it, the loss lands on your side. No amount of writing changes that.
So the useful work happens before any dispute. Amex’s prevention list starts with making sure your terminal is chip-enabled where possible, then checking ID on face-to-face sales, especially large ones, and getting a valid approval and an imprint for keyed sales.
The common mistake
Keying a card because the chip reader is slow or broken. A keyed sale on a chip card is exactly the gap F30 is built around. Fix or replace the reader.
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Upload the notice and your records. Dispute Daddy builds a response around the reason Amex actually gave, and you approve it before you submit. See how the method works.
