If they are chargepoint then you need a card which you can get for $5 on the chargepoint site.
I haven't seen a Chargepoint station in real life (only pictures) so I don't know for sure, but there wasn't any obvious place to swipe a card or anything like that. The charging stations were Eaton branded and looked pretty basic.
I got another e-mail from North Hills and the guy said he would e-mail me when they were operational. I like this guy--he is very proactive about the whole thing! I think we should all do our best to patronize North Hills (and other establishments that have taken the initiative to install charging stations).
Deep Blue Metallic 2018 Tesla Model 3 (31849) (delivered: 7/13/18)
Coulis Red 2016 SV (312310) (bought: 12/23/16 sold: 7/5/18)
Glacier Pearl 2012 SL (016138) (delivered: 12/9/11; traded in 12/23/16)