Reason Code 80 designates chargebacks where an account number or a transaction amount posted with an issuer differs from the one on the sales receipt....
Reason Codes 76 (used by Visa) and 4850 (MasterCard) designate chargebacks resulting when a credit is posted on a cardholder's account as a purchase....
Chargeback Reason Codes 73 and 4835 are issued when two conditions were met: a payment is made with an expired card and the transaction is not authorized....