Open theWalletapp on your Apple Watch.
Choose theMoremenu (three horizontal dots).
For an existing card, pickPrevious Cardsand select one.
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For a new card, pickDebit or Credit Card(or Apple Account or Transit Card) and thenContinue.
Adjust your name if necessary and enter the card number and additional details, and then selectContinue.
For a new card, you may need to verify your identity with the card issuer.
Open theWatchapp on your paired iPhone and go tothe My Watchtab
SelectWallet & Apple Pay.
For an existing card on your iPhone, go to theOther Cards on Your Phonesection and tapAdd.
If youre able to use Apple Pay, double-press thesidebutton (the rectangular button on the right).
If wrist detection is disabled, youll be asked for your passcode each time you use Apple Pay.
Participating retailers will provide the Apple Pay option during checkout.