You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: configuration.rb
    path of file: ./repos/rollbar-gem/lib/rollbar
    
    the code of the file until where you have to start completion: require 'logger'

module Rollbar
  class Configuration
    SEND_EXTRA_FRAME_DATA_OPTIONS = [:none, :app, :all].freeze

    attr_accessor :access_token,
     
    
    def merge!(options)
      options.each do |name, value|
        variable_name = "@#{name}"
        next unless instance_variable_defined?(variable_name)

        instance_variable_set(variable_name, value)
      end

      self
    end