Use rewards cards on Apple Watch
If you have a rewards card from a supporting merchant, you can add it to Wallet, then present it to a contactless reader as part of your transaction using your Apple Watch.
Add a rewards card to Apple Watch
You can add a rewards card from an email or website link or from a notification sent to your iPhone.
Email or website link: Look for an “Add to Apple Wallet” link. Tap the link to add the rewards card to Wallet.
Notification: After paying with Apple Pay and providing your rewards card information, you may get a notification on your iPhone that lets you add that card as a rewards card. Tap the notification, then tap Add.
Use a rewards card on Apple Watch
When you’re prompted to provide your rewards information (and you see the Apple Pay logo), follow these steps:
Double-click the side button.
Swipe to select your preferred payment card.
Hold your Apple Watch within a few centimeters of the contactless reader, with the display facing the reader.
Use your rewards card without paying using Apple Pay
Double-click the side button.
Swipe to the rewards card.
Hold your Apple Watch to the reader, with the display facing the reader.