anchor.diff:  FORMAT: 1A
  +HOST: https://helpful.io
   
   # Helpful API
   Helpful API is a service to interact with helpful.io  It provides API access to all the resources in the app.
  
positive.code:             }
  
  
  # Group Messages
  Messages related resources of *Helpful API*.
  
  ## Message [/message/{id}]
  A single Message object. The Message resource represents a single message that is part of a conversation.
  
negative.code: 
  When your app/client code wants to access Helpful as a user, it must request an auth_code.  That is done by having the user you want to act on behalf of visit the authorize_url:
  
      ```ruby
      callback = "urn:ietf:wg:oauth:2.0:oob"
      app_id = "f9682933bb81c9a76cc4dc6d7b2f4ba7a1db006cc986fa5e8e28d05fafde6dd9"
      secret = "23c7ebff714494e3871cf0ab163bb4e9b87bd4ad201521a3ce9e2e1ca984feda"
  
      client = OAuth2::Client.new(app_id, secret, site: "http://localhost:3000/")
  
      client.auth_code.authorize_url(redirect_uri: callback)
      # => "http://localhost:3000/oauth/authorize?response_type=code&client_id=f9682933bb81c9a76cc4dc6d7b2f4ba7a1db006cc986fa5e8e28d05fafde6dd9&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob"
      ```
  
  5. This URL will prompt the browser user if they want to allow the app and will return to you an auth_code (via callback or in the browser window).
  6. Your app should remember this auth_code!
  7. Then "trade-in" the auth_code for an access_token (Access tokens are short lived (2 hours).  Whenever it expires, you'll have to get a new one.
  
      ```
      auth_code = "b789332903d1a6e3ec07f1831c8c4e3d20031f576e19ff2ae24dcbb26285b205"
      access = client.auth_code.get_token auth_code, redirect_uri: callback
      token = access.token
      # => "fd7958b3d3d17ba9130718096b3a4cd4a4d8088cb29d41e4d74513fc9aeff5a8"
  
      access.get '/api/messages'
      # => #<OAuth2::Response:0x000000027c2778 .... (Normal HTTP Response stuff from the API call here)
      ```
  
  # Helpful API Root [/api]
  NOT IMPLEMENTED - BUT LEFT FOR FUTURE REFERENCE Helpful API entry point.
  