x1=m1 is a payment card reader for use/function x2=m2, accepting card x3=k1
Machines accepting payment cards (lejykarda), e.g. ATMs and terminals at point of sale/checkout. Cf. maksrikardymi'i, lejykarda, baxydinkarda, jitseldejykarda, detseldejykarda, vamveile'ikarda, banxa, jdini.