How do I change the e-mail address that receives Apple Pay notifications?

When I submit a transaction using Apple Pay, all of my notification e-mails go to the wrong address (one of mine, but not the correct one). On iOS, the relevant setting (Settings > Wallet & Apple Pay > Transaction Defaults) *already has the correct e-mail address*, but it's not used. I've also added the correct details *within* the Apple Pay payment screen but that isn't used or even remembered for subsequent purchases either. How do I select a different address for use with Apple Pay?