Every interchange category has eligibility rules. A debit card swiped chip-in-person qualifies for the lowest interchange. The same card keyed in over the phone gets bumped to a higher (more expensive) category. The same card swiped without proper AVS/CVV data on a card-not-present transaction gets bumped further.
Common downgrade causes: keyed-in entries, missing AVS, missing CVV, late batch closes (settling more than 24 hours after the sale), missing customer data on B2B transactions (Level 2/3 data), and missing fleet/healthcare/education data on specialty MCCs.
Fix: Use chip readers for in-person transactions, batch every 24 hours, enable AVS+CVV for online, and pass Level 2/3 data on B2B invoices. These changes alone can drop your effective rate 20–60 basis points.
