```ruby
class Auth0Controller < ApplicationController
  def callback
  end

  def failure
  end
end
```

Add the shell for the code that will hand the success and failure of the callback
user
```ruby
class Auth0Controller < ApplicationController
def callback
    # This stores all the user information that came from Auth0
    # and the IdP
    session[:userinfo] = request.env['omniauth.auth']

    # Redirect to the URL you want after successfull auth
    redirect_to '/dashboard'
  end

  def failure
    # show a failure page or redirect to an error page
    @error_msg = request.params['message']
  end
end
```
assistant