how do I update my credit card info
How do I update my credit card information for billing/payment
iMac
Open the iTunes app. Sign into your account information. Edit the Payment method.
ASC - Late 2012 Mac mini, macOS 10.13.4; Watch, 38 mm AL, watchOS 4.3; iPad Air 2 & iPhone 7+, iOS 11.3; TV 4th Gen, tvOS 10.3; Airport Express