The decline code 76, referred to as “Unsolicited Reversal,” indicates that a reversal transaction (an attempt to cancel or reverse a previously authorized payment) was received, but there was no matching authorization found. This means that the system did not recognize the original transaction that is being attempted to reverse, either because the original transaction did not exist or it was processed differently. This can occur due to various reasons such as entering incorrect transaction details or attempting to reverse a transaction that has already been settled. To resolve this issue, it’s important to verify the transaction details and contact the merchant or payment processor for further assistance.