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....
Merchants should monitor their average transaction amount and count in each credit card batch and alert their processor if either is substantially exceeded....
Visa chargeback Reason Code 72 results from processing transactions, which were above the merchant's floor limit, but authorization was not obtained....
Visa uses two-digit numbers called Chargeback Reason Codes to identify the reason a card issuer is disputing the validity of a particular transaction....