Root Cause

• Amount mismatch in reversal: The amount specified in the reversal request differs from the original authorized amount.
• Partial reversal attempt: American Express typically requires the full authorized amount to be reversed, not partial amounts.
• Incorrect transaction reference: A mismatch in the linked authorization and reversal transaction IDs.

Troubleshooting and Solutions

• Confirm that the reversal amount matches the original authorized amount exactly.
• Review the transaction logs to ensure the correct authorization reference is used.
• Ensure partial reversals are not attempted for processors like American Express that require full reversals.
• Retry the reversal only after correcting the amount or initiate a proper refund if reversal is not supported.