Those can be determined by the CC number, and a lot of companies (and some processors) just won't accept them (they're used a lot for money laundering since you

Those can be determined by the CC number, and a lot of companies (and some processors) just won't accept them (they're used a lot for money laundering since you can buy them with cash). For instance, Stripe reports them as "prepaid" and you can reject them. https://stripe.com/docs/api/cards/object#card_object-funding https://stripe.com/docs/api/cards/object#card_object-funding