require "datadog_api_client"
api_instance = DatadogAPIClient::V1::UsageMeteringAPI.new
opts = {
  month: Time.parse("2013-10-20T19:20:30+01:00"), # Time | Datetime in ISO-8601 format, UTC, precise to month: `[YYYY-MM]` for usage starting this month.
}

begin
  # Get billable usage across your account
  result = api_instance.get_usage_billable_summary(opts)
  p result
rescue DatadogAPIClient::V1::APIError => e
  puts "Error when calling UsageMeteringAPI->get_usage_billable_summary: #{e}"
end