title: API Explorer: Missing Certificate Error
body: <p>I am following these instructions: <a href="https://developer.intuit.com/docs/0020_customeraccountdata/007_firstrequest" rel="nofollow noreferrer">https://developer.intuit.com/docs/0020_customeraccountdata/007_firstrequest</a></p>
  
  <p>Everything seems to work, but I am getting a "Missing certificate" trying to connect to the API Explorer. My private key uploads just fine. </p>
  
  <p>I am leaving the "End User ID" blank because I am not sure what to put there, and the instructions do not specify what to put there.</p>
  
  <p><img src="https://i.stack.imgur.com/iLwi2.png" alt="enter image description here"></p>