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.
Notes:
You can use the tap & pay feature to pay for items just by touching your phone to a reader at a checkout register.
If your device doesn't have a payment app, you can browse Google Play for payment apps.
For the Tap & pay option to appear, NFC must be turned on.
From a Home screen, navigate: Apps icon > Settings > Apps & notifications.
Tap Advanced.
Tap Default apps.
Tap Tap & pay. All activated wallets are added under "Tap & pay". If multiple wallets are activated, a user can at any point change the default by going to "Tap & pay" and Payment default.