title: OAuth 2.0 without a login on iOS?
body: <p>For my current work project we're trying to use OAuth to secure a mobile API, but the app doesn't have user accounts, so authentication would take place invisibly from the user, where the app will send up some secrets to the server and receive the token to be used for subsequent web service calls.  The problem is, all the libraries and tutorials I can find implementing OAuth follow this pattern:</p>
  
  <ol>
  <li>Present a web view allowing a user to login</li>
  <li>Receive a callback to a custom URL scheme, and parse the necessary information to authenticate future web service calls</li>
  </ol>
  
  <p>How do I achieve this without the webview step?  I should be able to make an HTTP request directly with the correct credentials which will return the necessary authentication details.</p>
  
  <p>The app will use OAuth 2.0</p>