in lib/twurl/oauth_client.rb [205:216]
def perform_pin_authorize_workflow
@request_token = consumer.get_request_token
CLI.puts("Go to #{generate_authorize_url} and paste in the supplied PIN")
begin
pin = STDIN.gets.chomp
rescue SystemExit, Interrupt
raise Exception, "Operation cancelled"
end
access_token = @request_token.get_access_token(:oauth_verifier => pin.chomp)
{:oauth_token => access_token.token, :oauth_token_secret => access_token.secret}
end