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Endpoint: https://api.linkedin.com/v2/accessToken
JSON:
...
  "message":"Empty oauth2 access token",
  "status":401
}

my $linkedin = LWP::Authen::OAuth2->new(
    client_id                => 'xxxxxxx',
...
    print "Location: $auth_url\n\n";
    exit 0;
}

sub authorize_linkedin {
    my $token = $linkedin->request_tokens(
...
    print $data{'code'};
    exit 0;
}