UK-based mobile point-of-sale technology developer SumUp secured €10m ($11.2m) yesterday from existing investors including online discount service Groupon, payments processing firm American Express and BBVA Ventures, the venture capital division of bank BBVA.

Additional funds were provided by unnamed existing backers. The series E round boosted SumUp’s total funding to about $56m.

SumUp’s technology enables retailers to accept card payments through a device linked to a smartphone or tablet. The company, currently present in 13 countries, will use the funding…