报告API与cron作业 - 谷歌应用程序引擎python

I'm trying to connect to the reporting api to get some data of the percentage of usage of the emails of the users of a domain. I want to do it as a cron job every day so I need some method to authentificate as the admin of the domain authomatically without any admins interaction.I'm trying to connect to the reporting api to g