Newer pumps - Include not only custom keys for each pump, but also tamper protections that physically shut down a pump if the machine is improperly accessed
Feature a horizontal card acceptance slot along with a raised metallic keypad — much like a traditional payphone keypad and referred to in the fuel industry as a “full travel” keypad
Older pumps - Are secured via a master key that opens not only all pumps at a given station, but in many cases all pumps of a given model made by the same manufacturer.
Have a vertical card reader and a flat, membrane-based keypad.
In virtually all cases investigated by the SAPD, the incidents occurred at filling stations using older-model pumps that have not yet been upgraded with physical and digital security features which make it far more difficult for skimmer thieves to tamper with fuel pumps and siphon customer card data (and PINs from debit card users).
https://krebsonsecurity.com/2018/06/how-to-avoid-card-skimmers-at-the-pump/
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