Consumer Disputes
S03 Support Received
Details
American Express reason code S03 is a status notification indicating that Amex has received the merchant’s supporting documentation in response to a dispute. It doesn’t mean the case is resolved yet—only that the evidence is under review and the chargeback process is ongoing.
This code serves as a checkpoint in the dispute lifecycle, confirming the merchant’s timely response. While no action is required at this stage, merchants should stay alert for follow-up communications or resolution updates from Amex.
Timing to raise the dispute (Issuer/Cardholder)
Timing to respond to the dispute (Acquirer/Merchant)
How to respond?
No action required at this time—Amex has acknowledged your submitted documentation:
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Monitor the case for further updates or resolution notices
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Retain a copy of your submission and confirmation for reference
How to prevent?
Continue responding promptly and thoroughly to disputes to maintain your strong position:
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Use a system that tracks deadlines and confirms delivery of all submissions
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Prepare documentation templates in advance for faster, more effective responses