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Coming from a School that uses such a card system for every might, I suggest you add special Holographic IR/RF capability. That way you can just tap the card for unsecured areas as basic civilian stuff... Being able to tap you card instead always swiping it really cuts down on the wear and tear of cards and prevent you from having to get a new one every six months.
Also could you mention that National Back of Yamati does all the transactions of converting Nepleslian DA's to Yamataian KS and Yamataian KS to Azorean Neers (KS = Neer).
(Protip: all currency in SARP are easier with 1:1 ratios. It also allows new races an easier time ICly accepting foreign money or IOUs in military emergencies)
I like these, they are cool, and really help flesh out the nebulous 'KS Cards' that we have floating around everywhere.
Also, Dusk, While a 1:1 ratio does make it easier, it also makes it immensely boring for separate factions to mysteriously all have the same value for their units of currency. So, for now, let's not worry about making everyone's currency equal and rather have someone make an exchange rate page like Nashoba mentioned.
Since it seems to be a topic of interest as noted in the comments above, it would probably be beneficial to add in a link to the currency exchange page onto the page of the bank.