The article highlights CurrentC's brazen lack of privacy. From their policy:
> We share your information across our network of merchants and with our third party service providers. MCX may share...To third-party analytic providers and advertising partners to help us deliver, track and analyze the operations and effectiveness of our marketing campaigns, promotions or advertisements.
Apple knows nothing about your cards (they are all encrypted on-device), and nothing about your transaction except that there was A transaction (since Apple just sees a token that gets passed from you to the card provider).
The merchant doesn't see your real cc number, just a one-use token. So they can't track you unless you choose to add a loyalty card.
The card provider sees all details of the transaction. Just as now, and what you want.
And the real cc details are stored in dedicated silicon on a fingerprint-locked device.
It's worth noting that the token is one-per-vendor, rather than one-per-payment. This is what allows TFL to match your tap-in to your tap-out on the London Underground, and what allows them to apply daily/weekly capping on fares.