Explainers: Card payments
Interchange Fee vs MDR: Which Part of a Card Fee Is Which
The MDR is the whole charge for accepting a card; interchange is the issuer's slice inside it.
3D Secure Explained: Why Some Card Payments Ask for a Second Step
Why your bank asks you to approve some online card payments, when it can skip the step, and who pays for fraud.
Chargeback Fee: What a Disputed Card Payment Costs a Merchant
The chargeback fee Stripe, PayPal and Square charge, and the other costs of a disputed card payment.
Interchange-Plus vs Flat Rate: Choosing a Card Pricing Model
Interchange plus vs flat rate: one rate for every card, or the real cost of each card plus a markup.
Interchange Fee Explained: Where a Card Payment Fee Goes
Interchange fee explained: one processing fee on the statement, three payments to three different parties.
What Happens After You Tap Your Card?
The terminal's approval is one step in a longer journey from a payment request to settled funds.