- Press 'Copy Coupon Code' button above
- Press 'Open Store' button. If it says incompatible, go back and press that button again.
- Tap the Price/Buy button that show the price of that watchface. Do not worry because that will not deduct your credit.
- Dialog will be shown. Press button to change the payment method. Choose 'Redeem Code'
- Paste the code and finish the purchase.