I've been working on an EMV library with contact-less cards in mind, and it's actually pretty fun to implement a specification. So far it can only talk with one type of credit card. I don't know whether this is because my reader doesn't supply enough power to the other cards or because the other card manufacturers' were too liberal in their application of the EMV standard. I think it may be both.
I made a very comprehensive error-messaging function yesterday that takes in Status Words (SWs) and make them human-readable. So far it's been a fantastic help.
I finally got a key to the building a few days ago, so I won't have to bother the very nice cleaning ladies that get here early in the morning.
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