Two European clones of Square have merged. SumUp (Backed by Groupon and BBVA) and Payleven (Backed by Rocket Internet) have merged, terms of the deal were not disclosed. The new business will be led by SumUp's CEO, Dan Klein. The combined business will include 1m customers in 15 countries. It's believed that the merger is a result of both companies realizing how hard it is to build a successful payments company. These business command slim margins from card transactions and therefore need to achieve massive scale to succeed.