Amex chargebacks on Shopify: the 20 day clock, the reason codes and the proof Australian sellers need

A homewares seller in Adelaide gets a dispute on a A$480 lamp. She sees the usual Shopify banner, assumes she has two or three weeks, and plans to answer the following Monday. But the card was American Express, and the American Express Australia guide gives merchants 20 days from the date of the chargeback to challenge it. By the time she looks again the calendar has moved, and she has already burned more than half of it. Amex chargebacks run on their own rules and their own clock, and the first discipline is to read the dates on each one.

Amex chargebacks are disputes raised by American Express card members or by Amex itself against a merchant's charge. They follow reason codes published in the Amex Australia chargeback guide, with set time limits for raising them and for the merchant to challenge. This guide sets out what that guide says, how the codes group, which documents Amex accepts, how to handle retrieval requests and card-not-present disputes, how to build a calendar so no clock is missed, and how to read the deadline on each dispute in your admin.

This guide is for you if:

• You sell from an Australian Shopify store and customers sometimes pay with American Express.
• You have received a dispute on an Amex card and are not sure how long you have.
• You want a routine that treats Amex disputes separately from the rest.

Last updated: 22 October 2026. Written by the ChargeFix team. Reviewed against sources on 22 October 2026. General information, not legal or financial advice.

Disclosure. ChargeFix helps merchants respond to Shopify Payments disputes, so I benefit when disputes need answering. I read the American Express Australia chargeback code guide and Shopify's help pages on 22 October 2026. The Amex guide covers dispute codes and clocks, not fees or its fraud programme, so this post covers codes and clocks. The examples are made up.

The 30-second answer (TL;DR)

• The Amex Australia guide gives 120 days after processing for most disputes, and gives you 20 days after the chargeback date to challenge.
• Some codes count from another date (delivery or cancellation), and code 4554 for goods not received can stretch to 540 days in certain cases.
• The guide lists reason codes for card-not-present fraud, goods not as described or not received, cancelled recurring charges, credits not processed and more. Match your evidence to the code.
• Amex may also send retrieval requests asking for receipts or signed proof of delivery. Failing to reply in time may lead to a chargeback.
• Follow the deadline on each dispute's screen in your admin. It is the one that counts.

Do this today (10 minutes):

1. Search your Shopify disputes for any paid by American Express.
2. Write the chargeback date on each, and add 20 days.
3. Put that date in your calendar, and use it instead of the usual Shopify window for these disputes.

How an Amex dispute moves

Stage	What can happen	The record that protects you
Sale	Card member pays with Amex	Order, payment and delivery records
Retrieval request	Amex asks for a receipt or proof	Itemised receipt, signed proof of delivery
Chargeback	Amex reimburses the card member and charges you	A response matched to the code
Challenge	You have 20 days from the chargeback date	Evidence that fits the code
Outcome	Amex decides	Notes for next time
Later	Some codes can be raised long after the sale	Records kept for the longest window

What makes Amex chargebacks different from other card disputes?

The main difference is timing and structure. The Amex Australia guide defines a chargeback as Amex's reimbursement from the merchant for the amount of a charge subject to that right. It lists reason codes in the 4500 and 4700 ranges, and a separate set of retrieval request codes in the 6000s. It gives specific time limits, and it names the documents that Amex accepts in response.

By contrast, Shopify's help page for disputes says the response deadline is usually 7 to 21 days after filing, with 11:59 PM on the displayed date if no time is shown. Those two clocks are not the same, and where an Amex dispute appears inside Shopify, the date on the screen is the one to follow.

Feature	Amex, per its Australian guide	Shopify's general dispute page
Time to raise a dispute	Most up to 120 days after processing; some from other dates	No customer window given
Time for the merchant to challenge	20 days from the chargeback date	Usually 7 to 21 days after filing
Reason codes	Published list, 4500 and 4700 ranges	Reason categories such as fraudulent, not received
Retrieval requests	Codes 6003 to 6016	Not described
Where merchants check status	"Resolve Disputes" area in the Amex merchant account	The Shopify admin
Contact	1300 363 614 (weekdays, business hours AEST/AEDT)	Shopify support

The right-hand column is not a comparison of rules between networks. It is the information each page gives.

How do you know you are dealing with an Amex dispute?

Look at the card brand on the order and the dispute. In your Shopify admin, the payment details on the order show the card brand. A dispute on an American Express card will carry its own reason and dates. If you have a direct Amex merchant account as well, disputes on that account show in the "Resolve Disputes" area of your Amex merchant account, with each dispute and its reason code.

Shopify's page on chargebacks says the card issuer reviews evidence and that Shopify is not involved in the decision. For any Amex dispute, check the dispute screen in your admin for the instructions and deadline.

Where the dispute appears	Where to respond	Clock to follow
Shopify admin, on a Shopify Payments order	Shopify's dispute screen	The deadline shown there
Amex merchant account "Resolve Disputes"	The Amex merchant account	20 days from the chargeback date, per the guide
Not sure	Ask Shopify support or Amex	Assume the shorter clock until told otherwise

The last row is a safe habit. If you cannot tell which clock applies, treat the shorter as the real one until someone confirms.

What do the Amex reason codes mean?

The guide lists codes without grouping them, so the groups below are mine. They make the list easier to use, and each code is quoted as the guide gives it.

Group	Code	Meaning in the guide
Card not present fraud	4540	Card not present
Fraud	4763	Fraud full recourse
Fraud	4798	Counterfeit chip liability shift
Fraud	4527	Missing imprint
Processing and amount	4507	Wrong amount or account number
Processing and amount	4512	Multiple processing
Processing and amount	4530	Currency discrepancy
Processing and amount	4536	Late presentment
Processing and amount	4752	Credit or debit error
Authorisation	4521	Invalid authorisation
Authorisation	4755	No valid authorisation
Authorisation	4523	Unassigned account number
Goods and services	4553	Not as described or defective
Goods and services	4554	Not received
Goods and services	4544	Cancelled recurring charge
Goods and services	4750	Car rental charge
Credits and payments	4513	Credit not presented
Credits and payments	4515	Paid through other means
Support requests	4516	Support request not fulfilled
Support requests	4517	Support illegible or incomplete
Other	4534	Multiple ROCs
Other	4754	Local regulatory or legal dispute

For an online store, the codes you are most likely to meet are 4540 for card-not-present claims, 4553 and 4554 for goods problems, 4544 for recurring charges, 4513 for credits not processed and 4512 for double charges. The others come up in card-present, airline, hotel and car rental settings, or when a document request goes unanswered.

How long do you have on Amex chargebacks, and how do you work out the dates?

The guide gives three time facts. The first is a 120 day limit after processing for most disputes. The second: some codes run from other dates, the guide naming 4513 and 4553 as examples, such as delivery or cancellation. The third: code 4554 can run to 540 days in certain cases. Finally, the challenge window is 20 days, counted from the chargeback itself.

Work out both dates for every Amex dispute and put them in your calendar. Here are two made-up examples.

Item	Example A	Example B
Sale processed	15 July 2026	2 February 2026
Latest date a standard dispute can be raised	12 November 2026 (120 days after 15 July)	2 June 2026 (120 days after 2 February)
Chargeback date	3 November 2026	18 May 2026
Last day to challenge (20 days)	23 November 2026	7 June 2026
What to do	Respond by 20 November to leave margin	Respond by 4 June

The first date tells you how long you must keep records for a sale. The second tells you when to finish a response. Leave a margin of a few days in your own calendar, because a response that arrives on the last day is a risk.

Because some codes count from delivery or cancellation, and one can stretch much longer, keep delivery and cancellation records for much longer than 120 days. A simple rule is to keep the full evidence for any American Express sale for at least 18 months, longer for goods not received, and to delete it afterwards in line with your privacy policy.

What documents answer Amex chargebacks?

The guide describes the kinds of document that answer a chargeback, and it says what is acceptable depends on the code. Four kinds of evidence recur.

Evidence type	Example	Useful against
A correcting transaction	A refund that offsets the disputed charge	Any code, per the guide
Proof the transaction was valid	A signed receipt, delivery proof, valid authorisation	Fraud and goods claims
Proof the claim is incorrect	A return policy the card member did not follow, a signed carrier receipt	Goods and credit claims
Evidence the chargeback was raised in error	Proof of a different amount or duplicate	Processing codes

For a card-not-present dispute (4540), the guide lists compelling evidence options, including matching shipping addresses and device and account data for digital goods. That is the same logic as the evidence Shopify asks for on fraud disputes: billing and shipping details, IP and country, and fulfilment and tracking. Our separate guides on address match and IP evidence explain how to use them.

A correcting transaction is the simplest answer when you agree with the card member. If you have already refunded, send the refund record. If the customer deserves a refund, issue it, rather than lose the dispute and the money.

How do you respond to a card-not-present dispute (4540)?

This is the Amex equivalent of a fraud claim online. The card member says they did not make the purchase, or that the card was not present and they are not liable. Your answer is to show the buyer and the card were linked to the goods.

Build the response from the strongest links first: delivery to an address that matches the card member's billing address, earlier undisputed orders from the same customer and address, emails to the card member's address with replies, and, for digital goods, access logs showing the account and device used. Say plainly what you know and do not know.

Amex dispute, code 4540 (card not present)
Order #6120, A$480, processed 15 July 2026, chargeback 3 November 2026

1. Delivery. Delivered 21 July 2026 at 14:05 to 12 Smith Street,
   Adelaide SA 5000, signed for by "J Brown". [attach carrier proof]
2. Address. The billing address on the card matches the delivery
   address. [attach order page showing both]
3. History. The same email and delivery address placed orders #4402
   (March 2026) and #5011 (May 2026), both delivered and not
   disputed. [attach history table]
4. Contact. We emailed the order confirmation, dispatch notice and
   delivery notice to the card member's address. [attach emails]

If the delivery address does not match, say so, and lead with whatever else you hold, such as a confirmation email from the card member.

How do you respond to goods and services Amex chargebacks (4553, 4554, 4544)?

These are the most common for online stores, and each calls for different proof.

Code	Claim	Lead with	Also show
4553	Not as described or defective	The listing, photos of the item shipped, the card member's messages	Your returns policy and what the card member was offered
4554	Not received	Signed carrier receipt or delivery scan to the order address	Tracking history, emails to the card member
4544	Cancelled recurring charge	The consent to recurring billing, the renewal reminder, the cancellation record	Activity or delivery after the claimed cancellation

For 4553, the guide mentions a return policy the card member did not follow. That means your policy needs to be visible and dated, and the card member must have been able to see it. For 4554, it mentions a signed carrier receipt, so consider a signature on higher value parcels. For 4544, see our guide on subscription chargebacks.

Write what happened in order, in plain words, and attach each document with a one-line caption. Do not argue.

What is a retrieval request, and why does it matter for Amex chargebacks?

A retrieval request is Amex asking you for a copy of the original receipt or supporting documents for a charge. The guide lists codes 6003 to 6016 for these. Acceptable documents include itemised and signed receipts, proof of agreement or booking, and signed proof of delivery.

A retrieval request is not a chargeback, but failing to answer it in time may lead to one. The guide says that. So treat it as a deadline, answer it completely, and keep a copy of what you sent.

Request type	What to send	Why it matters
Copy of receipt	Itemised order summary	Answers the request
Proof of agreement	Order confirmation, terms accepted	Shows the sale was agreed
Proof of delivery	Signed carrier receipt or delivery scan	Shows the goods arrived
Not answered in time	Nothing	May become a chargeback

If you receive one, it is often a sign that the card member has queried the charge, which makes it a good moment to check whether a refund or a quick message could settle the matter.

What is the Fraud Full Recourse programme in Amex chargebacks?

Code 4763 is listed as fraud full recourse. The guide says only that a merchant can be placed in that programme and that a merchant can challenge a 4763 chargeback by showing it was not enrolled at the time. It does not describe the terms, the thresholds or the consequences, and I will not guess.

If you receive a 4763 dispute, read the dispute notice, check whether you were enrolled on the date, and contact Amex on the number in the guide for the terms. Ask in writing, and keep the reply.

Question to ask Amex	Why
Was my business enrolled in Fraud Full Recourse on this date?	The guide says a merchant can challenge by showing it was not
What triggers enrolment and removal?	The guide does not say
What does enrolment change for my disputes?	The guide does not say

Who do you contact about Amex chargebacks, and when?

The guide gives a phone number, 1300 363 614, for dispute questions, open weekdays from 8am to 6pm AEST or AEDT. Use it when the applicable clock is unclear, when you need the terms of a programme, or when a dispute notice is unclear.

Keep a log of calls: date, time, person, what was asked, what was answered. A call is not a record on its own, so follow up by email where you can.

Amex contact log

12 Nov 2026, 10:15  Rang 1300 363 614. Asked for the enrolment date of
                    Fraud Full Recourse for merchant account [number].
                    Spoke to [name]. Told: [answer]. Asked for it in
                    writing; email expected within 2 business days.
14 Nov 2026         No email received. Followed up by email to [address].

How long should you keep records for Amex chargebacks?

Because Amex chargebacks can be raised up to 120 days after processing, some run from delivery or cancellation, and another stretches much longer, the question of how long to keep records is not trivial. Delete too soon and you cannot answer. Keep too long and you hold personal data you have no reason to hold.

A sensible approach is to set a retention period by type of record and write it down, so you can show it if anyone asks. Here is a made-up policy that errs on the side of being able to answer. The periods are mine, not Amex's, and you should check them with your adviser against your own obligations.

Record	Suggested minimum	Why
Order and payment summary	18 months	Covers the standard window plus a margin
Delivery proof and signature	18 months, longer for goods that may be disputed late	Some codes run from delivery
Customer messages	18 months	Used for goods and credit disputes
Cancellation records	18 months from the cancellation	Some codes run from cancellation
Listing screenshots	18 months from the last sale of that listing	Shows what the card member saw
Records for an open dispute	Until the dispute is closed, plus a margin	You may need them again

When the period ends, delete the data, or anonymise it if you keep it for reports. Our separate guide on customer privacy and disputes covers what you may share, and the Australian Privacy Act position for small businesses is part of that.

To make retention practical, file records by order number from day one. A folder per order, with the same sub-folders every time, lets you find a document in under a minute and delete a whole order at once.

/evidence/ORD-6120/
  order-summary.pdf
  checkout-wording-2026-07-15.png
  packing-photo.jpg
  delivery-proof-2026-07-21.pdf
  messages.pdf
  refund-record.pdf   (if any)
  notes.txt           (dates of calls, requests, responses)

A dispute can then be answered in minutes, because the folder already holds what the code asks for. And because Amex disputes can arrive late, the habit of filing everything at the time of the sale is the best protection you have.

Should you fight every one of the Amex chargebacks?

No. Fight when the evidence matches the code. Accept, or refund, when it does not, or when the card member is plainly right.

Question	If yes	If no
Does your evidence fit the specific code?	Fight	Think harder
Do you hold a signed receipt or delivery proof?	Strong for goods claims	Weak
Do you hold a refund that offsets the charge?	Send the correcting transaction	Consider issuing one
Is the 20 day clock still running with time to spare?	Respond	Prioritise the response now
Is the amount above your time cost?	Worth answering	May not be

On Shopify Payments in Australia the dispute fee is A$25, returned only if you win, per Shopify's page. No tool can promise a win, because the card issuer decides.

What is a dated plan to be ready for Amex chargebacks?

This plan starts on Monday 26 October 2026 and runs to the end of the financial year.

Date	Task	Output
Mon 26 Oct	Check which of your payment routes accept Amex and where disputes appear	A one page map
Tue 27 Oct to Fri 30 Oct	List disputes from the last 12 months paid by Amex	A table with codes and dates
Mon 2 Nov to Fri 6 Nov	Build a calendar that adds 20 days to each chargeback date	A shared calendar
Mon 9 Nov to Fri 13 Nov	Write the response templates for 4540, 4553, 4554 and 4544	Four templates
Mon 16 Nov to Thu 26 Nov	Set a retention rule for Amex records	A written policy
Fri 27 Nov	Black Friday: watch for document requests	A log
Mon 4 Jan to Fri 29 Jan 2027	Answer post-Christmas disputes within the shorter clock	Responses filed early
Wed 30 Jun 2027	End of financial year: review Amex outcomes	A report

What does this look like for three Australian merchants?

These are made-up examples.

A homewares seller in Adelaide. Amex is about 8 percent of orders. After missing a clock, the owner adds a calendar rule: every Amex chargeback date plus 20 days, with a reminder at day 12. She also adds a signature requirement above A$300. The next Amex dispute is answered on day 11.

A jewellery brand in Perth. Average order A$600, with more Amex use than most. The owner keeps signed delivery proof and photos of every piece. A code 4554 dispute arrives and is answered with the signed carrier receipt and the dated photo.

A software seller in Hobart. Digital goods. A 4540 dispute arrives on a A$120 licence. The owner responds with the access log, the account email and the order history, since there is no shipping address. The delivery proof is the log.

What is different for Australian merchants?

The Amex guide is an Australian one, with an Australian phone number and AEST/AEDT hours, so the time facts in this guide are the ones Amex gives for Australia. Shopify's dispute fee for Australia is A$25, returned only if you win. Shopify Protect, which covers some fraud chargebacks, is for US stores only on Shopify's own pages, so Australian merchants carry fraud risk themselves.

The Amex guide has its own codes, clocks and merchant portal, so do not assume the Visa and Mastercard process applies to Amex chargebacks.

What are the common mistakes with Amex chargebacks?

1. Using the Shopify window for an Amex dispute. The Amex guide gives 20 days from the chargeback date.
2. Not writing the dates down. Both the raise-by date and the challenge date matter.
3. Treating a retrieval request as optional. Failing to answer may lead to a chargeback.
4. Matching the wrong evidence to the code. A delivery scan does not answer a recurring billing claim.
5. Ignoring the correcting transaction. A refund can end a dispute you should not fight.
6. Deleting records at 120 days. Some codes count from delivery or cancellation instead.
7. Guessing about Fraud Full Recourse. Ask Amex in writing.
8. Not logging calls. A call is not a record.
9. Submitting before the evidence is complete. Shopify says early submission locks your edits.
10. Missing the deadline. After it passes, you cannot add evidence.

Frequently asked questions

What are Amex chargebacks?

Amex chargebacks are disputes raised against a merchant's charge on an American Express card, under reason codes published in the Amex Australia chargeback guide. The guide gives time limits for raising them and says a merchant has 20 days from the chargeback date to challenge. Match your evidence to the specific code.

How long do I have to respond to an Amex chargeback?

The Amex Australia guide allows 20 days, counted from the chargeback date. That can be shorter than the usual window shown on a Shopify dispute, so work out the date for each one and use the earlier. If the applicable clock is unclear, ask Shopify support or Amex.

How long after a sale can Amex chargebacks be raised?

The guide says most disputes can be raised up to 120 days after Amex processed the transaction. Some codes run from other dates, such as delivery or cancellation, and code 4554 for goods not received can run to 540 days in certain cases. Keep delivery and cancellation records far beyond 120 days.

What is Amex code 4540?

Code 4540 is card not present, the online equivalent of a fraud claim. The guide lists compelling evidence options such as matching shipping addresses and device and account data for digital goods. Lead with delivery to an address that matches the billing address, order history and emails to the card member.

What is an Amex retrieval request?

It is a request from Amex for a copy of the receipt or supporting documents for a charge, under codes 6003 to 6016 in the guide. Acceptable documents include itemised and signed receipts, proof of agreement and signed proof of delivery. Failing to answer in time may lead to a chargeback.

Can I use a refund to resolve an Amex dispute?

Yes. The guide says a correcting transaction that directly offsets the disputed one is accepted for every code. If you agree with the card member, or the amount is small and the case is weak, refunding can be cheaper than fighting. Send the refund record as your response.

Who do I contact about Amex disputes?

The guide gives 1300 363 614, Monday to Friday, 8am to 6pm AEST or AEDT, and says disputes are listed in the "Resolve Disputes" area of the Amex merchant account. Keep a log of calls and follow up in writing.

What does an Amex dispute cost in Australia?

On Shopify Payments in Australia the disputed amount and a A$25 fee leave your balance when a chargeback opens, and the fee returns only if you win, per Shopify's page. A A$480 sale therefore costs A$505 at once on Shopify.

What is Fraud Full Recourse?

Code 4763 is listed as fraud full recourse. The guide says only that a merchant can be placed in the programme and can challenge a 4763 chargeback by showing it was not enrolled at the time. It does not give the terms, so ask Amex in writing what enrolment means for your account.

Should I fight every Amex dispute?

No. Fight when your evidence fits the specific code, such as a signed receipt for goods not received or delivery to a matching address for card not present. Accept or refund when it does not. A weak response takes time and cannot be changed once it has been filed.

Start free trial with ChargeFix

For Amex chargebacks, the evidence you collect at the time of the sale decides the outcome, and the dates decide whether you can use it. ChargeFix reads the real order, payment, tracking and delivery data for each Shopify Payments dispute, scores the evidence and drafts the response from your own records, never inventing facts. You review and file it, or let Auto mode handle them. Start free trial

Sources

• Chargeback code guide, American Express Australia
• Responding to chargebacks and inquiries, Shopify Help Center
• Chargebacks and inquiries, Shopify Help Center
• Shopify Protect, Shopify
• ChargeFix support page