Paderborn, Germany, 2015-4-9 — /EPR Retail News/ — At Apps World Germany, mobile developers will get together at the so-called Hackfest to create new apps for Wincor Nixdorf's "Albert", the world's first portable, multifunctional and interactive touchscreen payment device. The Hackfest premieres on April 22-23 at the CityCube, Berlin to challenge teams of mobile developers and…