iCloud Keychain lets you easily store not only your passwords, but your credit card information as well. Any time you pay with a card in Safari, iCloud Keychain will offer to save it for you. However, you can also add cards to iCloud Keychain any time you wish. That way, you can do it when it's most convenient, and avoid having to run for your wallet when it's not. If an ounce of prevention now saving you a pound of effort later sounds good, here's how to do it!
iCloud Keychain will now remember that card and sync it across all your iOS 7 and OS X Mavericks compatible devices.
If you have specific questions about iOS 7 or OS X Mavericks in general, check out our iOS 7 help and discussion forum or OS X Mavericks help and discussion forum. For more on Safari in specific, check out our ultimate guide: