question: Authenticate your credit card with Strong Customer Authentication (SCA)
answer: 
  To use our apps and configurations, please sign up for an ExpressVPN account first.
  
  Under the EU’s Revised Directive on Payment Services (PSD2), ExpressVPN is now required to authenticate credit cards through Strong Customer Authentication (SCA) to reduce fraud and make payments more secure.
  
  This regulatory requirement affects customers whose card-issuing financial institutions are located in the European Economic Area.
  
  For older customers, this means you will need to perform a one-time SCA step to authorize your payments when it’s time to renew your subscription.
  
  For new customers, this means there will be an SCA step when you pay for your subscription for the first time.
  
  My ExpressVPN subscription is up for renewal. How do I perform SCA for my credit card?