This feature manages payment apps. The Tap & pay option doesn't apply to Android Beam and won't include certain apps such as money transfer apps.
From a Home screen, navigate: Apps > Settings Settings > NFC and payment (Phone section) > Tap and pay.
All activated wallets are added under "Tap & pay".
If multiple wallets are activated, a user can change the default at any point by going to "Tap & pay" and update selection.