If you are signed in, open Account → Saved Cards.
Add a card
Tap Add a card and complete the secure card form. The card appears in your saved-card list after it is saved.
Choose a primary card
Tap a saved card to make it the primary card for future checkout. You can still choose another available card during a purchase.
Remove a card
Tap the remove action beside a card and confirm. You cannot remove the primary card without choosing another card first.
Saved cards are optional. You can also add a new card during checkout.