UX question here: I noticed on the blog's screen shots that "self checkout, but for apartments" is used. How did you come up with "self-checkout" as the action?

UX question here: I noticed on the blog's screen shots that "self checkout, but for apartments" is used. How did you come up with "self-checkout" as the action? Checkout seems so far away in time re: the process flow. What was your users' mental model?