This SDK is a PHP client library that supports several methods for making authenticated calls to the Google APIs. This client library is in beta that includes; Simple API Access, OAuth 2.0 For Webservers, OAuth 2.0 Service Accounts and ID Token Verification. Google Developers provides APIs, software development tools, and technical resources that allow communication with Google Services and their integration to other services. Google is a technology company that specializes in Internet-related services and products that includes online advertising technologies, search, cloud computing, software, and hardware.
Stormpath made a name for itself with its backend, REST API that provides registration and authentication. The REST API operates in the backend of an app. As serverless architecture grows in use, a need for a frontend registration and authentication services arose. Enter the Stormpath Client API.
User authentication in apps is a pain, even if you've built an authentication system dozens of times. Forms, sessions, user tables, validation, password management, the list goes on in the seemingly never-ending to-do list for setting up a simple signup, login, and logout system for your app. OpenID company Janrain makes it easier, building on top of social networks.
There are three standard ways to manage API authentication these days: API keys, OAuth tokens and JSON Web tokens (JWT). Adam Duvander over at the Zapier engineering blog explains how and when to use them. The humble API key is the common and earliest form of API authentication.