Reference pagesReason codes
Fraud
American Express F24: No Cardmember Authorisation
A American Express dispute reason code, what it asks you to prove, and what Do The Proof puts in the response.
What this code means
Denies the charge
The inventory records that Stripe labels this code "Multiple ROCs", which is Amex's own name for F14.
What the network says wins it
valid Authorisation for the Transaction
or credit already processed
- Authorization and processing records
How Do The Proof handles it
Arrives in Do The Proof as: Fraudulent
Proof this usually needs
- Customer email
- Billing address
- Shipping address
- Tracking number
- Delivery confirmation
- Customer name
- Checkout IP
- Access activity
What the app cannot collect for you
Access activity. If you have login, download or usage records for this customer, add them to your dispute response. Records like these live on your own systems rather than in Shopify, so they have to come from you.
How long you have to respond
- Merchant response
- 20 days from the inquiry or chargeback notice
There is no pre-arbitration. American Express is both the issuer and the network, and rules after one merchant response; it may then issue a final chargeback.
Merchants in the FR2, FR4 and FR6 programmes get no inquiry at all.
Where this comes from
- American Express, Merchant Regulations International, 17 April 2026 Read 2026-09-08.
- Stripe, reason code categories Read 2026-09-08.
Other American Express fraud codes
Do The Proof drafts dispute responses for Shopify stores. Connect store