There's a sign on the wall of a bread shop near us (why is it always the bread stores we have problems with?) The minimum credit card payment is 5,000 won (about £2.64). So the woman behind the counter - obviously the owner - is really chatty and pleasant. My wife buys 7,500 won's worth of various items, gets to the counter, draws out her credit card, and the owner's face just changes immediately. She stares at the card coldly and takes it slowly - there is no more pleasant conversation.
On the way out the customer normally says '수고하세요', which is basically 'keep up the good work'. The store owner really has to reply, because it would be rude not to. There's nobody else in this small bread shop and the owner very obviously doesn't reply. It's not the first time this type of thing has happened, though this was the most noticeable because the change from chirpy to ice-cold the moment the card was produced was remarkable. I suppose the moral of the story is that whatever minimums card payments they advertise, some Korean store owners just prefer cash, and may not be happy about receiving anything else.
Korean tags: 가게, 사다, 빵