Shopify now has support for the payment gateway viaKLIX. ViaKLIX is a part of the Nova Processing Network, which is one of the largest payment processors.
From the Nova Information Systems homepage:
NOVA and euroConex boast an expanding global reach that delivers merchant processing in more than 30 countries and supports the payment needs of more than 1,000,000 merchant locations across the globe. NOVA is the third largest U.S. credit card processor, euroConex is a top 4 acquirer in the European market place, and together, we hold a position among the top 10 processors worldwide.
Special thanks to Sal Scotto who contributed the code to to ActiveMerchant.