Chargeback Reason Code 77 is issued when a transaction wasn't authorized and was processed using an account number that isn't on file with the issuer....
Chargeback Reason Code 76 is issued when a transaction is posted with an incorrect transaction (e.g. as a sale rather than credit) or currency code....
Reason Code 73 designates chargebacks resulting when a merchant accepts an expired card and doesn't obtain an authorization approval from the issuer....