Click in a credit card field when making a purchase.
Choose from a list of your stored credit cards.
If your Mac or Apple keyboard has Touch ID, and you want to use Touch ID to fill in credit card information, choose Apple menu keychain. It’s also encrypted in your iCloud Keychain if it’s set up on your Mac.
If you remove credit card information in Safari, it’s deleted from your macOS keychain. It’s also removed from your other Apple devices if your Mac and other devices are set up for iCloud Keychain.
For security, set up your Mac to Autofill your user name and password in Safari on MacAutofill info from Contacts in Safari on Mac