What the cardholder is claiming
“I was charged twice for one purchase.”
Separate orders with their own details, or a refund of the duplicate, answers a P08 dispute.
Evidence that wins a Amex P08 chargeback
Start with the required items — they answer the claim directly. Recommended items make a borderline case stronger.
Two separate transactions Required
Each charge has its own authorization, receipt and amount: they're not the same payment twice.
Two separate orders Recommended
Separate orders, items or deliveries for each charge.
Correspondence Recommended
Anything confirming both purchases.
How to respond to a Amex P08 dispute
- 1
Check the due date in your processor’s dispute dashboard. Responses that arrive late lose, however strong they are.
- 2
Collect the required evidence: two separate transactions.
- 3
Add what strengthens the case: two separate orders, correspondence.
- 4
Write a short response that answers the cardholder’s claim point by point, and cite the exact document and page behind each point.
- 5
Combine it into one clean package and submit it through your processor’s dispute portal.
Why Amex P08 chargebacks happen
- The customer pressed “pay” twice, or the checkout retried after a timeout.
- A settlement batch was submitted more than once.
- Two genuine, separate orders that look alike on a statement.
How to prevent them
- Use idempotency keys or duplicate checks on payment requests.
- Review settlement batches before they are sent.
- Refund a real duplicate straight away, before it becomes a chargeback.
Amex P08 chargeback FAQ
- What does Amex reason code P08 mean?
- Duplicate Charge. The Card Member says they were charged more than once for the same purchase.
- What evidence do I need to win a Amex P08 chargeback?
- Required: two separate transactions. Also strengthens your case: two separate orders, correspondence.
- How do I respond to a Amex P08 chargeback?
- Gather the evidence above, write a response that answers the cardholder’s claim point by point and ties each point to a document, and submit it through your processor’s dispute portal before the due date shown there. Chargeback Warden checks your evidence against the Amex P08 checklist and drafts the cited response for you to approve.