@tamarindcode Authorize.Net doesn't differentiate between different kinds of payment cards -- credit cards, debit cards, and prepaid cards are largely handled identically. We don't have any means to filter out one kind or another, unfortunately.
I'm curious about your use case. Would you be willing to share why you want to focus exclusively on debit cards?
An example of why debit only card payments would be helpful: I work with a non-profit organization in Nebraska and COVID 19 has greatly impacted our fundraising ability due to event cancellations and state gaming law restrictions. A recent bill passed allowing non-profits to sell raffle tickets online or in-person with a debit card; credit cards are prohibited as a form of payment for raffle tickets.
We use Authorize.net on our website and would like to sell raffle tickets. To allow card sales, we need to restrict card payments to debit only. Support for this feature would be greatly appreciated. Thank you.