def get_air_usage(imsi:nil, from:(Time.now.to_i - 24 * 60 * 60), to:Time.now.to_i, period:'minutes')
      @api.get(path: "/stats/air/subscribers/#{imsi}", params: { from: from, to: to, period: period })
    end
def get_air_usage(imsi:nil, from:(Time.now.to_i - 24 * 60 * 60), to:Time.now.to_i, period:'minutes')
      @api.get(path: "/stats/air/subscribers/#{imsi}", params: { from: from, to: to, period: period })
    end
Subscriber毎のAir使用状況を得る(デフォルトでは直近１日)