I developed one such machine, but it was a quarter century ago, so they can have evolved in a completely different direction meanwhile.
This automatic cashier could read a barcode, let the customer pay with a bank card, and deactivate the anti-theft stripe, optionally reactivate it.
The anti-theft stripe is covered with permanent magnets which, after they're made, deactivate the stripe by saturating it, so the detectors at the store's exit don't notice the stripe. The magnets are chosen weak, but it still takes a good magnetic field to make them, and at some distance through the air. This demands a strong current in the deactivating coils, which I obtained over a short time by capacitor discharge.
The combination of significant field, strong current and short time creates a mechanical shock that is noisy. It could be reduced by making the coils stiffer and suspending them separately from all surfaces. I didn't care at that time, possibly nobody did meanwhile.
In a different experiment, I had 350V and 20kA in several turns that created 7T, and this one was much more noisy. Even the feed cables had to be hold on the table or they would jump away from the other. The friend how did that regularly told me that once a connection screw wasn't tied, it just vaporized when the current passed, and he stays deaf for a day.