Amex Reason Code M01: What It Means and What to Do

A notice with Amex reason code M01 can look like a fresh dispute. It is not. M01 means something you did in an earlier round let American Express move the case forward. Here is what the code means and how to answer it.

What is Amex reason code M01?

Reason code M01 is Chargeback authorization. It sits in the Inquiry/Miscellaneous group, not in the fraud or cardholder dispute groups.

The code means the merchant's Inquiry reply authorized American Express to process a Chargeback. In other words, an earlier reply from you gave American Express the go-ahead to take the money back.

That sounds odd, so it helps to see where M01 fits in the Amex process.

Why you received an M01 inquiry

American Express works a disputed charge with the Card Member first, before the merchant is contacted. If more information is needed, the merchant receives either an Inquiry or a Chargeback.

You get an Inquiry when a Card Member disputes a charge that cannot be resolved with the documents on file. American Express asks you for proof. Your reply either settles the matter or moves it along.

M01 appears when your reply did not settle it. Instead, your answer authorized the next step, and that step is a Chargeback. A merchant who agrees credit is due can reply by the due date with its authorization for a Chargeback. If you did that, M01 is the result.

How M01 differs from a standard chargeback

A standard chargeback starts with the Card Member's claim. The code names the claim, such as fraud or a service problem. Your proof has to answer that claim.

M01 is different. The dispute itself is not new. The code points back to your own reply in the Inquiry round. If the Card Member gave enough information, your account may have been debited upfront.

So do not hunt for a fraud defense or a delivery record. The question is what you said in your Inquiry reply, and whether you meant to authorize a chargeback at all.

How to respond to an M01 inquiry

Read the notice and find the due date first. Then decide what happened in the first round.

If you meant to authorize the chargeback because credit is due, the case is mostly done. Keep your records and watch for anything further.

If you did not mean to authorize it, say so. The best way for a merchant to respond to a dispute is online through its Merchant Account. Your supporting documents should include a copy of the charge record or credit record.

A good reply explains the documents, addresses the specific dispute reason and describes the steps taken to resolve it. Label each paper so the reader knows what it shows. Keep it short and pointed at the real issue.

For help reading the notice itself, see how to read a chargeback notice.

What happens if you do not respond

Ignoring the notice is the worst move. If a merchant's reply settles the dispute on time, there is no Chargeback. Silence gives up that chance.

After a Chargeback, the merchant can send supporting documents that might reverse it. The Chargeback is undone if the reply addresses the dispute successfully and on time. If the merchant does not reply in time, or does not send the requested documents, the Chargeback stands.

So the money stays gone, and the case closes without your side of the story. To see how replies move through the later rounds, read what happens after you answer a chargeback.

Best practices for avoiding M01 in the future

Read every Inquiry reply before you send it. If your reply says credit is due, that is an authorization for a Chargeback. Make sure you mean it.

Answer Inquiries with full proof, not with a quick agreement. A complete reply that settles the dispute on time stops the case before it becomes a chargeback.

Set a reminder for every due date the day the notice arrives. Late replies lose even when the proof is good.

Keep copies of charge records, credit records and anything you send. If a case returns in a later round, you will need them again.

Sources

• americanexpress.com