From what I've read, the fancy credit card terminal that was deployed nationwide is actually not compatible with European-style chip-and-pin, which will be the next version of credit card standard. So billions were spend for nothing.
The hardware is compatible, but the software isn't. From what I understand, the card enumerates what applets it has installed and the POS picks the first one it knows how to interact with.
The mess of bad hardware, software and UX really makes the acronym POS so appropriate ;-)