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: batch_operation.rb
    path of file: ./repos/koala/lib/koala/api
    
    the code of the file until where you have to start completion: require 'koala/api'
require 'koala/api/graph_batch_api'

module Koala
  module Facebook
    
    
        def to_batch_params(main_access_token, app_secret)
          # set up the arguments
          if @access_token != main_access_token
            @args[:access_token] = @access_token
            if app_secret
              @args[:appsecret_proof] = OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new("sha256"), app_secret, @access_token)
            end