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I think I've had more machines refuse to accept my coins than refuse to give me change after a purchase. Given how many fake coins are in circulation that are

• lovehashbrowns 4y ago
  Back in the olden days when you got a crisp bill and saved it specifically in case you needed to get something from a vending machine later on. Those were good days! I don't think I've carried cash for many years now. Was kind of an issue in San Francisco where some restaurants still didn't accept card payments.
  • Lio 4y ago
    These days I find I rarely even keep credit/debit cards on me. I’ve got so used to using Apple Pay with my phone, it works pretty much everywhere in the UK. I guess the next wave for me will be setting up a smartwatch with Garmin Pay.
• Animats 4y ago
  There's a long history of coin detection. A company called National Rejectors developed the first coin rejector that was any good, and dominated the business until their patents ran out. You can still buy a standard National Rejectors coin unit on eBay. It's a very clever little piece of machinery, about six inches square and an inch thick. Size, weight, bounce, and magnetic properties are checked, and nickels, dimes, and quarters are sorted. One of the classics of mid 20th century mechanical design.