iCloud: Remove credit cards from Apple Pay in iCloud Settings
If you have a device set up to use Apple Pay, you can remove the credit, debit, or prepaid cards from the device in iCloud Settings.
Go to Settings on iCloud.com, then click a device listed below My Devices.
If you don’t see the My Devices section, your account just has access to iCloud web-only features. To gain access to other iCloud features, set up iCloud on your iOS device or Mac.
Below the list of cards on the right, click Remove or Remove All.
If no cards are listed, the device isn’t set up to use Apple Pay.
If you remove credit, debit, or prepaid cards from a device set up to use Apple Pay, the ability to spend using those cards on that device is removed, even if the device is offline.
For information about adding cards back to a device, see the documentation that came with the device.