title: How to get authKey value from this object using php
body: <blockquote>
    <p>SME\AuthKeyTransactionResponse Object (
    [authKey:SME\AuthKeyResponse:private] =>
    f45c0309-85a5-433c-8bd1-0d681e8cdf40
    [apiResponse:SME\Response:private] => SME\APIResponse Object (
    [responseCode:SME\APIResponse:private] => 0
    [responseText:SME\APIResponse:private] => Success ) )</p>
  </blockquote>
  
  <p>how to get this value: <strong>f45c0309-85a5-433c-8bd1-0d681e8cdf40</strong> using php</p>