ZEN Card basics

What is a ZEN PRO Card? When should I use a ZEN PRO card, ZEN card, or ZEN Travel card? How to use a ZEN Card What benefits do I get when I use a ZEN Card? What is a physical card? What is a virtual card? What is a ZEN Card? What is a ZEN Travel Card? How to use ZEN PRO Card for subscription payments Where can I pay with a ZEN Card? Can I choose whether my ZEN Card is Mastercard or Visa? What happens when my ZEN Card is about to expire? I received a notification "You have inactive virtual card"