iOS
If you purchased the iOS app via the App Store, you will need to update your credit card details and billing address by heading to the App Store directly.
Desktop
If you purchased your subscription on desktop, and would like to update/change your credit card details, or billing address, please go to:
Account
Manage my plan
click on the pencil next to existing credit card details
Add payment method
Click Update
Your credit card details are now updated!