So businesses (especially small businesses) can operate in one of two basic ways. As a Cash Business or as a Multi-Payment Business. Multi-Payment businesses generally accept things like credit cards, cash, checks (sometimes), and debit cards you don't need to accept all of these to count as a Multi-Payment business but must accept at least two. Cash Businesses are places where they say "Cash Only" good examples use to be farmer's markets and flea markets, but since the advent of Square and other easy use credit card scanning services even these have become mixed to some extent.