"The skimmers were attached internally... Nobody would have noticed these devices just looking at the outside of these pumps. But when you open them up to change say a credit card receipt reel, then they’re easily noticeable.”
Here is proposed solution for payment data security:
"All the clerks have checked the pumps and they’re continuing to check them on a daily basis so if any more of these are installed they should be taken down fairly quickly”.
Sounds like effective Intrusion Detection System.