Every card payment pays three parties, even when the statement shows a single rate. Your customer's card-issuing bank receives interchange, the card network takes its own share, and the processor that moves the money adds its charges on top.
Visa describes interchange reimbursement fees as “transfer fees between acquiring banks and issuing banks” on each Visa transaction, and says merchants do not pay them as such: merchants negotiate and pay a “merchant discount” to their own financial institution, typically a percentage per transaction (Visa: regulations and fees, checked October 2026). Intuit's guide to its processing statements makes the same split from the merchant's side: discount fees are “paid by a merchant to their customer's card-issuing bank and card associations,” while its authorization fee is a per-transaction charge Intuit itself assesses (Intuit: understand your credit card processing statement, checked October 2026). What moves the cost most is how the card is taken. Intuit's statement guide notes that “swiped rates are lower,” and the published rates below show the same pattern: in-person payments are cheapest, and a card number typed in by hand is the most expensive.