An open protocol to allow secure authorization in a simple and standard method from web, mobile and desktop applications.

http://oauth.net/

Diagram source from postman.com.

Diagram source from postman.com.

OAuth 2.0: Implicit Flow is Dead, Try PKCE Instead

Diagram source from postman.com.

• Documentation: https://dev.twitter.com/oauth/overview
• Developper applications settings: https://apps.twitter.com/
• OAuth urls:
  • App-only authentication https://api.twitter.com/oauth2/token
  • Request token URL https://api.twitter.com/oauth/request_token
  • Authorize URL https://api.twitter.com/oauth/authorize
  • Access token URL https://api.twitter.com/oauth/access_token
• Account verify credentials https://api.twitter.com/1.1/account/verify_credentials.json

• http://oauth.net/code/

• PHP OAuth API on phpclasses.org: package, blog