American Express Reason Code A08

What is

The authorization was valid when obtained, but had expired by the time the charge was captured.

Too much time passed between authorization and capture, exceeding the authorization's validity window.

A timing/processing issue, usually fixable by capturing sooner after authorization.

Authorization and capture timestamps from your system.

Submit the authorization and capture timestamps, and re-authorize if the charge is still disputable and unpaid.

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Delayed-capture flows (e.g., waiting for fulfillment) that exceed the authorization's validity window.

Capture promptly after authorization, or re-authorize automatically if capture will be delayed.