American Express Chargebacks: What's Different About Amex (And It's a Lot)

Amex Is Both the Network AND the Issuer

This is the fundamental difference that changes everything. With Visa and Mastercard, the card network sets the rules, but the issuing bank (Chase, Bank of America, etc.) handles the actual dispute with the cardholder. With American Express, Amex is the network AND the issuer. They set the rules, manage the dispute, and make the final decision.

This means Amex disputes have a different process, different terminology, and different evidence requirements. What works for Visa won't necessarily work for Amex.

Terminology matters: Amex calls cardholders "Card Members" (not cardholders) and calls merchants "Establishments" (not merchants). Using the wrong terminology in your evidence submission signals that you're submitting a generic template, not an Amex-specific response.

The Inquiry Phase — Where Most Hotels Leave Money on the Table

Before Amex files a formal chargeback, they often send an inquiry — a request for documentation about the transaction. You have 20 days to respond to an inquiry.

This is where most hotels make their biggest mistake: they ignore inquiries or treat them as low priority. Here's why that's costly:

If you resolve the issue during the inquiry phase, there is no chargeback on your record. The transaction doesn't count toward your chargeback ratio. There are no chargeback fees. It's as if the dispute never happened.

If you ignore the inquiry or respond late, Amex escalates it to a formal chargeback. Now you're dealing with fees, ratio impact, and a harder fight.

Action item: Set up a system to flag and prioritize Amex inquiries. They should be treated as urgent — more urgent than chargebacks from other networks, because resolving them early has a much bigger payoff.

Reason Code F29 — Card Not Present Fraud

This is Amex's equivalent of Visa's 10.4. The Card Member claims they did not authorize a card-not-present transaction.

What evidence wins:

• Proof the Card Member participated: booking confirmation emails, correspondence, OTP verification
• IP address and device data from the booking or check-in
• Check-in verification showing physical presence at the Establishment
• Folio with itemized charges
• Any 3D Secure or SafeKey authentication data

Reason Code C18 — No-Show / CARDeposit

This is Amex's hotel-specific code. It covers no-show charges and advance deposits. Amex has a proprietary system called CARDeposit that governs how hotels can charge for no-shows and cancellations.

CARDeposit requirements:

• The cancellation policy must be communicated to the Card Member at the time of booking
• The policy must specify the exact charges for no-show or late cancellation
• You must have a CARDeposit agreement in place with Amex (check with your processor)
• Confirmation of the reservation and cancellation policy must be sent to the Card Member

What wins a C18 dispute:

• Signed CARDeposit agreement or digital acknowledgment
• Booking confirmation showing cancellation policy
• Proof the Card Member did not cancel within the allowed window
• Communication records with the Card Member

The Rule Most Hotels Don't Know

Amex cards cannot be used to charge for damages, losses, penalties, or fines after checkout without a separate signed authorization.

This means you cannot:

• Charge a guest's Amex card for smoking damage found after checkout
• Bill an Amex card for missing items discovered by housekeeping
• Apply a damage deposit or fine to an Amex card without the Card Member's explicit, written authorization for that specific charge

If you do, the Card Member can dispute it and Amex will almost certainly rule in their favor. For damage charges, you need a separate authorization signed by the Card Member specifically for that amount — the check-in authorization doesn't cover it.

Amex OptBlue — Small Merchant Limitations

If your property processes Amex through OptBlue (the program for merchants with under $1M in annual Amex volume), your evidence submission is limited to:

• 1 MB maximum file size
• Black-and-white only (no color scans)
• Fewer dispute categories and response options

This is significantly more restrictive than standard Amex processing. If you're on OptBlue, you need to compress your evidence aggressively. Use text-based PDFs rather than scanned images, and prioritize the most compelling evidence since you can't include as much.

Tips for Winning Amex Disputes

1. Respond to every inquiry within 20 days. This is your best chance to resolve the issue without a chargeback.
2. Use Amex terminology. Say "Card Member" and "Establishment," not "cardholder" and "merchant."
3. Include the Amex case number on every page of your evidence.
4. Focus on digital evidence. Amex values IP addresses, device data, and digital consent over paper signatures.
5. Know your OptBlue limits. If you're on OptBlue, plan your evidence package to fit within 1 MB, black and white.
6. Never charge Amex cards for post-checkout penalties without separate written authorization.