Hmm, so basically no one may make any purchases or transactions during Saturdays? I understand why you would want to do this from a religious perspective, but that would also be a huge limitation not to use ones wallet during holidays.
Would this be implemented to different time zones too, as the time of Saturday is different in various places in the world?
Well, yeah, religious people impose limitations on themselves all the time.
I'm not a Rabbi, not am I religious ... so I don't know what will be required.
Maybe it should encompass Saturday in all the timezones to be 100% Glat Kosher.