title: token requests always results in "Authorization code is invalid."
body: <p>Seems no matter what I do, requesting a token I always get the <code>Authorization code is invalid.</code> response. I have tried this both in Ruby code and via Curl.</p>
  
  <pre><code>curl -X POST https://partner.api.beatsmusic.com/oauth2/token -d client_secret=SECRET -d client_id=MYID -d redirect_uri=http://foo.example.com/auth/beats_oauth2 -d code=rjmsqtgntc5k6s8jhdawpu4c  
  </code></pre>
  
  <p>results in: </p>
  
  <pre><code>{"code":"InvalidCredentials","message":"Authorization code is invalid."}
  </code></pre>
  
  <p>Same results for the RoR code.</p>
  
  <p>any suggestions would be great as I have been working on this for a few days!</p>
  
  <p>thanks!
  Gary</p>