subscription-retention

This skill answers one question: how a paid subscription is kept from ending without the person's decision, and how it ends when the person decides: what is said before the end of a term and when, what the program does when a charge fails, and what happens on the cancel screen.

Not who counts as drifting away, and not what to send somebody who left: those belong to the neighbors. What lives here is the end of a term and the two cases it can open. Three properties set it apart from the rest of the library.