I am trying to use native facebook app’s authentication credentials in browser. Planning to use fb://authorize URL scheme, it seems it is not working.
Is there any way I can use native facebook application user credentials instead of asking the user to login again within the browser?
You can only do this with a native application on the device whose identity (bundle id on iOS, keyhash on Android) has been registered with Facebook. In all cases the identity of the native application is verified, the user must approve the permissions requested by the application, and the user has the ability to revoke these permissions in privacy settings.
It would violate users’ privacy if it were possible for a web site to find out the identity of a user just because they had the Facebook app on the same device they were using to browse the internet.