Open the Wallet app on your iPhone
Tap the card you want to remove
Tap the More button
Tap Card Details
Tap Remove Card
Confirm the removal
If needed, open Settings
Tap Wallet & Apple Pay
Select the card
Tap Remove This Card
Confirm the removal
For Apple Watch cards, open the Watch app on iPhone
Tap Wallet & Apple Pay
Select the card
Tap Remove Card
Confirm the removal