title: How to integrate the AWS Cognito built-in UI?
body: <p>I've been experimenting with Cognito for a few days, and I am now testing the Built-in signing UIs. I have managed to get it working, I am able to see the login page and successfully login with a User I have created. For my callback URL I'm using localhost:3000 as a testing ground, where I'm running a React SPA.</p>
  
  <p>However, I am at a complete loss about what to do once I'm redirected. The documentation says I should get a URL with a JWT as a query parameter. Instead, I'm getting a URL of the form:</p>
  
  <p><code>localhost:3000/?code=########-####-####-####-############</code></p>
  
  <p>where <code>#</code> is an alphanumeric character. I don't recognize this code, I don't think it is a JWT. I would highly appreciated it anyone could:</p>
  
  <ol>
  <li>explain what it is</li>
  <li>direct me to any kind of documentation on how to use it? </li>
  </ol>