Why does my Genius Countertop device decline Zero Dollar Authorizations on some Discover cards? The Genius MX915 and MX925 Countertop devices do not support Zero Dollar Authorizations on contactless EMV Discover cards.
How do I change the card types I can accept on my terminal? You can add or remove the following card types: PIN debit EBT Voyager WEX American Express Discover To add or remove any of these card types, contact our Customer Support team.