From the Watch app main screen on iPhone, scroll to Wallet & Apple Pay.
Tap Wallet & Apple Pay.
Tap Add Card.
If you don't have a passcode set up on your Watch, follow the onscreen prompts to set up a passcode.
Select your preferred payment method.
Tap Continue.
Tap Enter Card Details Manually.
Enter the card number.
Tap Continue.
Scroll to select the expiration month.
Scroll to select the expiration year.
Tap the Security Code field.
Enter the security code.
Tap Continue.
Tap Agree.
Some cards may require extra verification. If required, follow the on-screen prompts.
You've completed the steps!
