title: Facebook Marketing APi How to get campaign by id
body: <p>i need to get campaign by id, but as i see from
  <a href="https://developers.facebook.com/docs/marketing-api/reference/ad-campaign-group" rel="nofollow">documentation</a> there are only one method <code>/{ad_account_id}/campaigns</code></p>
  
  <p>and i get all campaigns in result set.</p>
  
  <p>How to use Graph Api to get only one item by id?</p>
  
  <p><code>GET</code> <code>/campaign/{id}</code> not working, how can i filter it by id? or even ids</p>
  
  <p><code>GET</code> <code>/{ad_account_id}/campaigns</code></p>