01What counts as a user in your system?
FindingA license key. No email attached, on purpose.
02Where does the truth live?
FindingTwo databases and three payment providers: Stripe (twice), PayPal and Paddle.
03What can’t you change, and why?
FindingAn old privacy decision, GDPR, and Germany’s double opt‑in.
04What happens when it breaks?
FindingIt lands on support: 12,000 billing tickets a year.