Nic Raboy, an application developer, shares insights on implementing OAuth 2.0 in Ionic applications using the ngCordovaOauth library, which he developed to simplify obtaining access tokens for popular web APIs like Google. The library, integrated into the official ngCordova project, offers promise-based login flows to handle successful authentications and errors. It is compatible with any Apache Cordova or Phonegap application using AngularJS, though it relies on the Apache Cordova InAppBrowser plugin and requires redirect URIs to point to http://localhost/callback. The post provides examples of using the library for OAuth authentication with various services, showcasing how to manage access tokens and interact with web APIs. Support for providers such as Google, Facebook, and Dropbox is already available, with Twitter support anticipated.