Before October 2015, most European mPOS providers were not particularly interested in the U.S. market, which had yet to embrace EMV security. However, since the EMV liability shift sent ripples through the market, foreign companies, like U.K.-based SumUp, have shifted their attention across the pond. While Square, the company known for its sleek mPOS terminals, had previously dominated the mPOS market in the U.S., SumUp and others like it are now fighting to wrestle some of that control of the market away from Square.