Aqui puede ver definiciones.
https://en.wikipedia.org/wiki/Chargeback#Merchant_penalties
Merchant penalties[edit]
The merchant's acquiring bank accepts the risk that the merchant will remain solvent over time, and thus has an incentive to take a keen interest in the merchant's products and business practices. Reducing consumer chargebacks is crucial to this endeavor. To encourage compliance, acquirers may charge merchants a penalty for each chargeback received. Payment service providers, such as PayPal, have a similar policy.[7] PayPal Merchant charges $20 for each chargeback (regardless of whether or not it is the first) plus it will retain the original transaction fee.[8]
In addition, Visa and MasterCard may levy severe fines against acquiring banks that retain merchants with high chargeback frequency. Acquirers typically pass such fines directly to the merchant. Merchants whose ratios stray too far out of compliance may trigger card association fines of $100 or more per chargeback.[9]