1. OAuth 2.0 Tutorial
2. OAuth 2.0 Overview
3. OAuth 2.0 Roles
4. OAuth 2.0 Client Types
5. OAuth 2.0 Authorization
6. OAuth 2.0 Endpoints
7. OAuth 2.0 Requests and Responses
8. OAuth 2.0 Authorization Code Requests and Responses
9. OAuth 2.0 Implicit Requests and Responses
10. OAuth 2.0 Resource Owner Password Credentials Grant - Requests and Response
11. OAuth 2.0 Client Credentials Grant - Requests and Response

When the client application requests authorization and access tokens it sends HTTP requests to the authorization server, to its authorization and token endpoints. What request and response is sent forth and back depends on the authorization grant type. Remember, the four grant types are:

• Authorization Code Grant
• Implicit Grant
• Resource Owner Password Credentials Grant
• Client Credentials Grant

The request and response of each of these authorization grant types is explained in more detail in the following, separate texts.

The information presented in the following texts is, however, mostly a summary. In order to get all the details of what it all means, you may have to consult the OAuth 2.0 specification, or the documentation of the system (Facebook, Twitter, Foursquare etc.) you are trying to integrate with.