I would hope that these logs don't include the full details of the credit card (such as number/cvv).. if it does, the company that is logging this info could end up having some issues with Visa/MC

Edit: Now that I looked at it a little deeper, i'm assuming they are talking about these[0] sort of files?

[0]: https://docs.helix.q2.com/docs/card-transaction-file

PCI DSS is a relatively new thing. Before it card data flew in the open