My “Founding Member” key died early. While I waited for the replacement, using the credit card linked to my Citibike account was the alternative. Worth noting: I was only offered this alternative after I raised a bit of a ruckus. At that time (original software / original kiosks), whenever I wanted a bike, I had to read through “War and Peace” (or bumph about that long) on the kiosk’s tiny screen, and additional charges kicked in after 30 minutes. I’m glad the arrangement has been streamlined.