External root document

gistfile1.json

{
  ":self": "http://api.playup.com/external",
  ":type": "application/vnd.playup.provider.services+json",
  "user_finder": {
    ":href": "http://api.playup.com/external/users/{user_token}",
    ":type": "application/vnd.playup.external.user+json"
  }
}