Auditing Payment Fees: Five Places You Are Probably Being Overcharged
Most teams check a payment statement by comparing the total against volume times contracted rate, and move on if it is close. The overcharges hide in how rules are applied rather than in the arithmetic - domestic transactions charged a cross-border fee, conversion applied twice, refunds that do not return the fee, tiers that never trigger, fixed fees counted twice. This article lists the five points, a auditable cross-check table, and how to recover what was taken.