Photo: Brandon Bailey — Midnight Cowboy (CC-BY-2.0)Managing user authentication and authorization is a very serious responsibility, and getting it wrong can cost a lot more than unauthorized access to your app. It can also compromise user privacy or lead to financial damage or identity theft for your users. Unless you are a huge company with a huge security team, you don’t want that kind of responsibility or liability for your app.Most apps today are built with username and password authenticati...