class Fastly::Service

Otherwise it returns the invoice for the current month so far.

If a year and month are passed in returns the invoice for that whole month.

Return a Invoice object representing the invoice for this service

def invoice(year = nil, month = nil)
  opts = { service_id: id }
  unless year.nil? || month.nil?
    opts[:year]  = year
    opts[:month] = month
  end
  fetcher.get(Invoice, opts)
end