My missus recently put a new debit card on her Apple pay on Apple iphone.

She didn't use it but did use one her existing cards on Apple pay. However the debit was made against the new card. I know this was the case as I saw her carry out the transaction.

We only realised when she got a notification from the new card bank.

Anyone come across this odd behaviour on Apple pay a(i.e. debiting incorrect card) and how does she sort it out.