Depends. I've seen and heard multiple stories of cab drivers or business owners failing to process using Square. For them, it certainly was more of an annoyance than a painkiller. In most these cases, I ended up paying cash.

Also, here's a truth about painkillers that few talk about: painkillers are quickly commoditized. This is why you'll find vitamins to cost more than tylenol even though it's the Tylenol that helps you when you have 102 fever.