SumUp, one of the myriad of European mobile card reader startups taking advantage of Square’s continued absence in the region to build out a business, is adding support for American Express. Its ...

SumUp, the London-based payments startup, today launched the SumUp 3G Reader — a card terminal that lets merchants process payments without the need for a mobile app or a constant Wi-Fi connection.

In the increasingly crowded mobile payment card-reader space, it’s not just technology that’s being cloned. In the scramble to build traction and outrun the pack, startups are borrowing each others’ ...