A commissione is a fee charged for each transaction, usually calculated as a percentage of the payment amount, a fixed amount, or both. In card payments and POS systems, it is one of the main costs a merchant pays to accept electronic payments.
In cyber security, commission structures matter because attackers often target payment flows where small, repeated transactions can hide abuse. Card testing, refund fraud, bot-driven purchases, and compromised payment terminals can all create unexpected fee spikes and make losses harder to spot. Defenders monitor transaction velocity, average ticket size, and reconciliation gaps to detect suspicious activity. Understanding commissions helps security and finance teams tell the difference between normal payment costs and signs of fraud or system compromise.