How do I update my payment information through Apple/iTunes?

iTunes-billed subscribers can update their payment information on iTunes using a computer or an iOS device. 

Computer 

Follow these steps: 

1. Open iTunes. 
2. At the top of the computer screen or iTunes window, select Account > View My Account (and sign in). 
3. Select Manage Payments next to Payment Information. 
4. Make the necessary edits to your payment method. 
5. Click Done to save the changes. 

iPhone or iPad 

Follow these steps: 

1. Open the Settings app. 
2. Select your name > iTunes & App Stores. 
3. Tap your Apple ID > View Apple ID, and sign in, if prompted. 
4. Tap Manage Payments. 
5. Add or update your payment method.