Before they were structured as "convenience fees". You could buy with a card, but they'd charge a small fee that was either a percentage of the total or a flat

Before they were structured as "convenience fees". You could buy with a card, but they'd charge a small fee that was either a percentage of the total or a flat rate. Minimum purchase amounts were way more common when debit cards were becoming a thing. Basically, you'll find these things mostly in poorer places nowadays where even the store/restaurant owners are struggling and those card fees add up.