Your refund may fail due to the following reasons:
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The payment was already refunded.
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The refund amount was higher than the original payment amount.
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You provided the authorization ID in the refund request instead of the payment ID.
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Your sub-account does not have sufficient funds to process the refund. You can add funds to your sub-account balance and retry the refund.
To troubleshoot, you can look up the transaction events and details in the Dashboard. For more details, see
Find the payment transaction events and details in the Dashboard.