Field Credit Card / Types of cards

I just ran into a project deployment blocker. We have forms with field type of Credit Card and there is no option for Discover card value. I need to deploy this asap. I considered changing this to type select/manual but I really want to keep the SC function of card number validation. Any suggestions?

I’m not sure what this cc datatype does on checking, but if you use another datatype you might consider http://www.braemoor.co.uk/software/creditcard.php