Wiki: A dark pattern is “a user interface that has been carefully crafted to trick users into doing things, such as buying insurance with their purchase or signing up for recurring bills.

The law: “When entering a transaction the final price needs to be shown” (?)

The following screenshot of an Apple Pay transaction is hopefully not an example of a dark pattern, but rather a bug or an oversight:

Oh nice, it’s FREE. Or is it?
Only if you are lucky to swipe down a little bit will you see the real price: