# File lib/googleauth/user_authorizer.rb, line 75
      def initialize client_id, scope, token_store, callback_uri = nil
        raise NIL_CLIENT_ID_ERROR if client_id.nil?
        raise NIL_SCOPE_ERROR if scope.nil?

        @client_id = client_id
        @scope = Array(scope)
        @token_store = token_store
        @callback_uri = callback_uri || "/oauth2callback"
      end