title: How to create lookalike audience by choosing PIXEL_ID as a source (just like in UI Interface) using Facebook Marketing API
body: <p>I can create lookalike audience in Audience manager (GUI interface) but I can't find it in facebook marketing api  documentation. </p>
  
  <p>As this mentions <a href="https://developers.facebook.com/docs/marketing-api/audiences/guides/lookalike-audiences" rel="nofollow noreferrer">link</a> only three ways to create lookalike audience, but I can't find any thing related as a solution to my problem.</p>
  
  <ul>
  <li>Existing Custom Audiences</li>
  <li>Campaign or Ad Set conversions</li>
  <li>Page fans</li>
  </ul>
  
  <p>Thanks.</p>