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Registering Client App in Facebooke - OAuth

Registering App with Facebook

To register app in Facebook follow the link and create a new app. https://developers.facebook.com/

Once we created the app you can see the app details in the dashboard and the screen that looks something like this.



Here we can notice the Appid and Appsecret for the created Facebook app. [Client ID & Client Secret]

When registering a client app to configure with OAuth we have need to consider 5 main parts, such as client ID, client secret, redirection endpoint, authorization endpoint and token endpoint.
The "key" (that is, access token) is passed back via the redirection endpoint in step 4 Redirection endpoint:

It is a very important property in the client application. This helps the service providers to call back the application and to pass control back to your application and even send you important information.[tokens/error messages]

In OAuth authorization process [1st step] users need to login to the service provider’s authorization endpoint and authorize the client application [user consent page]. After user completed this process controls must be handed to the client application. This done via redirection endpoint.
 
We can give one/many redirection endpoint(s) to the app we are creating [Settings->Basic].
After set our redirection endpoint we have to find the service providers authorization endpoint as well as token endpoint. For Facebook, it built those properties in a library file and encourage us to use that SDK file [this SDK file interact with Facebook OAuth service]. Anyway the authorization and token endpoints of Facebook are:

Authorization endpoint -> https://www.facebook.com/dialog/oauth

Token endpoint -> https://graph.facebook.com/oauth/access_token

Now you are having all the necessary properties.
Client ID 2032416086987946
Client Secret 1fd424a4b9dac1b9c8b28974cd0b87e6 [sample secret ID]
Redirection endpoint http://localhost:8080/my-web-app-2/callback.html
Authorization endpoint https://www.facebook.com/dialog/oauth
Token endpoint https://graph.facebook.com/oauth/access_token
Let’s build our application !!!

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