title: Box API access token: invalid_client
body: <p>I am trying to work with the Box API and need an access token. I followed the tutorial video here: <a href="https://www.youtube.com/watch?v=ha26tN8amI0" rel="nofollow">https://www.youtube.com/watch?v=ha26tN8amI0</a> to get an authorization code and then exchange it for an access and refresh token. Here is the post request I made into Post Man:</p>
  
  <pre><code>https://api.box.com/oauth2/token?grant_type=authorization_code&amp;client_id=&lt;my_client_id&gt;&amp;client_secret=&lt;my_client_secret&gt;&amp;code=&lt;code_given_on_redirect&gt;&amp;redirect_uri=http://0.0.0.0
  </code></pre>
  
  <p>The response I get is:</p>
  
  <pre><code>{
    "error": "invalid_client",
    "error_description": "The client credentials are invalid"
  }
  </code></pre>
  
  <ul>
  <li>Unless I am completely losing my mind, I am positive I am entering the correct client_id and client_secret from my application page. (I tried several times.)</li>
  <li>I sent this post request in less than 30 seconds after it was generated.</li>
  </ul>
  
  <p>Any idea what I might be missing? Thanks.</p>