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: client.rb
    path of file: ./repos/ruby-openai/lib/openai
    
    the code of the file until where you have to start completion: module OpenAI
  class Client
    include OpenAI::HTTP

    CONFIG_KEYS = %i[
      api_type
      api_version
      access_token
      organization_id
      uri_base
      req
    
    def initialize(config = {}, &faraday_middleware)
      CONFIG_KEYS.each do |key|
        # Set instance variables like api_type & access_token. Fall back to global config
        # if not present.
        instance_variable_set("@#{key}", config[key] || OpenAI.configuration.send(key))
      end
      @faraday_middleware = faraday_middleware
    end