The other half of a subscription, written down

Nine articles on what happens after somebody buys: a cancellation reaching your site, a cancellation that only takes effect at the end of the paid period, an expired card that deliberately changes nothing, what a refund does and does not do, how to read the labels on a member, and how to tell whether a connection is genuinely working. Writing them turned up a real inconsistency in the product, which was fixed before the article about it went out.