class OpenAI::Client

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].nil? ? OpenAI.configuration.send(key) : config[key]
    )
  end
  @faraday_middleware = faraday_middleware
end