question: Update your account’s credit card details
answer: 
  This guide will show you how to update the credit card details associated with your ExpressVPN account. This enables you to renew your subscription using a different credit card from the one you used to sign up.
  
  You can only see your credit card information in your account settings if you previously purchased your subscription through the ExpressVPN website.
  
  Important: To remove a credit card associated with your account, contact the ExpressVPN Support Team.
  Sign in to your ExpressVPN account.
  Select Edit Credit Card. (This option only appears if you have added a credit card to your account.)
  
  Enter your new credit card information.
  
  Select Save credit card details.