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For more details about the response, instead call verify_sync($otp), which 
returns a hash containing all the parameters that were in the response.

  $result_details = $yk->verify_sync('<YubiKey OTP here>');
  if($result_details->{status} == 'OK') ...


As an alternative, you can call verify_async, which will return a condition 
variable immediately. This can be used if your application already uses an 
asynchronous model. You can also pass a callback as a second parameter to 
verify as well as verify_async, which will be invoked once validation has
completed, with the result.

  $result_cv = $yk->verify_async('<YubiKey OTP here>', sub {
      #Callback invoked when verification is done
      $result_details = shift;
      if($result_details->{status} eq 'OK') ...
  });
  
  #Wait for the result (blocking, same as calling verify directly).