Reason code · American Express
Amex P01: unassigned card number
P01 means you submitted a charge to an invalid or incorrect card number, often a canceled or replaced card still on file. Amex’s guide notes you may resubmit if you can verify the correct number.
What P01 means
P01 is a processing-error code. You sent a charge to a card number that is invalid or wrong. Amex’s guide lists the usual causes:
- The account number no longer exists, for example because the card was canceled or replaced.
- There was no approval, and the charge was keyed manually to an invalid number.
- Recurring billing or an automatic renewal was charged to a card number that no longer exists.
Who raised it
Usually nobody is complaining about the purchase. P01 is about the card number itself. The charge went to an account that isn’t there.
Time limit
Processor guides list this code at 120 days from the transaction date, in line with Amex’s general 120-day window for Card Members (Amex’s word for cardholders).
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 accepts an imprint confirming the card number, proof you got an approval for that number, a charge record from a terminal that read the card electronically, or a refund that already offsets the charge.
You may get a second try
Here’s the useful part. Amex’s guide notes that you may resubmit the charge if you can verify and provide the correct card number. A P01 isn’t always a dead loss. If the customer really does owe the money, get the right card details from them, get a valid approval, and charge again.
Card-on-file businesses see P01 most. Cards get replaced after fraud, after loss or at renewal, and an automatic charge goes to the old number. Amex’s prevention advice is to get approval for every transaction and to dip or swipe the card when it’s present.
The common mistake
Keying a number from a note or old file without getting an approval. If the approval had been requested, the bad number would have been caught before it became a chargeback.
Dispute Daddy builds this for you
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.
