rate_limiter.rb

# before

invoiced = Invoiced::Client.new("{API_KEY}")


# after

RateLimiter = Struct.new(:really) do
  def method_missing(method, *args)
    if can_do_the_thing?
      really.public_send(method, *args)
    else
      raise CantDoTheThing
    end
  end
end

invoiced = RateLimiter.new(Invoiced::Client.new("{API_KEY}"))