: Machines often feature QR codes that customers can scan to provide feedback, report issues, or receive promotional rewards.
: Most machines require the operator to first open the machine with a physical key and press a "service" or "security" button inside before these codes will work.
: Extensive testing by independent reviewers has shown these "secret codes" almost never work for the general public.
: These sequences are used to set product prices, monitor sales, or test dispensing mechanisms.
: A common myth is that these codes are programmed so owners can get free snacks without their keys, but as noted above, keys are strictly required to activate service modes.