Amex A08 — Authorization Approval Expired: What It Is and How to Respond

⚠️ 20-Day Deadline: American Express gives you only 20 calendar days to respond — shorter than Visa (30 days) or Mastercard (45 days). Act within 48 hours of receiving notification.

Amex A08 is triggered when a transaction was settled after the authorization approval had expired. Amex requires that settlements be submitted within the authorization validity window. If this window passes before settlement, the authorization is no longer valid and A08 is filed.

A08 overlaps closely with A02 (No Valid Authorization) — both involve invalid authorizations. The distinction is that A08 specifically identifies the expiry of an otherwise valid authorization, while A02 covers a broader range of authorization failures. A08 most commonly affects merchants with delayed shipment models, pre-order systems, and hospitality businesses where the gap between authorization and settlement can exceed 7 days.

Common reasons you received this dispute

1Pre-order transaction authorized at time of order but not settled until shipment — weeks later
2Hotel pre-authorization held for an extended stay, settled at checkout past the validity window
3Manual batch settlement that missed a submission cycle
4System outage delayed settlement past the authorization expiry

Can you win this dispute?

Fight this dispute if...

✓You can show settlement was within the authorization validity period through timestamped processor records

Accept this chargeback if...

✗Expired authorizations are objective — if the timestamp shows expiry, there's little to argue

Key deadlines

Response window: 20 calendar days from the notification date. Act within 48 hours — do not wait.

Amex’s 20-day window is shorter than Visa (30 days) or Mastercard (45 days). Prioritize Amex disputes accordingly.

How to prevent this chargeback

1
Use daily automatic settlement: Daily automatic settlement eliminates the risk of a missed cycle pushing a transaction past the authorization validity window.
2
Re-authorize at shipment for pre-order models: For pre-orders and delayed shipments, re-authorize at the time of shipment rather than holding the initial authorization from the order date.
3
Re-authorize for extended hotel and rental stays: For hospitality businesses, re-authorize mid-stay for extended bookings rather than relying on a single hold that may expire before checkout.
4
Monitor for unsettled transactions: Set up alerts for any authorization that approaches its expiry without a corresponding settlement. Catch these before the window closes.

Frequently asked questions

What is Amex A08?

Amex A08 is triggered when a transaction was settled after the Amex authorization had expired. The most common causes are delayed shipment models (authorized at order, settled at shipment weeks later) and missed settlement cycles.

How long before an Amex authorization expires?

Amex authorization approvals are typically valid for 7 days from approval. Hotel and car rental pre-authorizations may have different validity periods defined in your merchant agreement.

How do I prevent A08 for pre-order businesses?

Re-authorize at the time of shipment rather than holding the initial authorization from the order date. Most payment gateways support a two-step authorize/capture workflow where you can re-authorize when ready to settle.

Can I re-charge after an A08?

You can attempt to charge the card again with a new authorization, but the cardholder may have filed A08 precisely because they want to dispute the charge. A new authorization and capture is technically possible but commercially risky.