They made it compulsory by law to accept cards for B2C if you sold more than like 15k eur/month. But I think you were already in DE.
I think that law also cames with caps on card charges. Or at least there was so much competition between banks for the new market that purchase charges dropped on their own.
No, I was born and live there.
My groceries kiosk has just the single terminal.
Where I shop, only Dedeman, Altex and the eMag showroom still ask me what bank is the card from, and they're nowhere near small...
Edit: Hmm. Cozy? Small world...