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: 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.