I am using the LinkedIn iOS SDK using oAuth in my IPhone application. Its integarted successfully but After login it goes to Success Authrized Screen as in images
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Check this out http://developer.linkedin.com/message/8675#8675
If you are not using an oauth callback, the user will need to return to your application themselves and input the token for you to use for verification. If you are using a callback, the user will never see the PIN screen. See the documentation on Using OAuth with the LinkedIn APIs for more information.