Bain Capital Credit, Goldman Sachs Private Capital, HPS Investment Partners, and TPG Sixth Street Partners recently led a $371-million (€330 million) debt financing round for SumUp, the U.K.-based card payment processor focused on small businesses. Previously, SumUp received more than $100 million in equity funding from over 15 investors, including BBVA and Holtzbrinck Ventures. SumUp, which was founded in 2011, has a customer base of 1.5 million small businesses in Europe, Brazil, Chile, and the U.S. It expects revenue to top $223 million (€200 million) this year, up more than 100% ove...