Troy-Go to order information>credit card list and from there you can either hide the ones you don't want or delete them.

Missed the last part. As long as the debit card has the ability to do a credit transaction, which most do now. I don't use authorize.net so not sure on whether they have the ability to enter a pin code for a typical debit transaction.

Thanks Nutrition, that is what I needed.

I use Authorize.Net and there isn't a place for a pin number. If the debit card has a Visa or Mastercard logo, the customer doesn't need a pin number anyway. The transaction will just process like a credit card.