Okay, If I understand you now. If you'd like to build a prototype geared to the Greek market? Because if that's the case, I'd recommend a mobile solution rather than a card based solution. Matters not what kind of phone they have, old flip fone, smartphone... The key to making it work is a middle office. You'd have to build that. Where would customers get their BTCs? From storefronts or online via the exchanges? If I am hearing you about your target market we can work out more details...