I suspect this has to do with the POS software Russian stores use being inflexible or bank SDKs being restrictive. Probably the latter, as I've seen some kiosks

I suspect this has to do with the POS software Russian stores use being inflexible or bank SDKs being restrictive. Probably the latter, as I've seen some kiosks that take card payments just pop up a Windows window with the Sberbank logo and transaction status instead of showing that in their own UI.