Account information: your email address and, if you choose to set one, the name shown on your certificate. We do not collect or store passwords for course accounts — sign-in is via a one-time code emailed to you.
Course activity: pages read, quiz and exam answers and scores, exercise responses you write, and certificate issuance — used to run the product (progress tracking, gating, certificates) and nothing else.
Payment information: processed directly by Stripe. We receive confirmation that a payment succeeded and a reference id; we never see or store your card number.
Technical data: standard server logs (IP address, browser type, timestamps) kept briefly for security and abuse prevention.
Referral data: if you arrive through an affiliate's referral link, the code it carried, and if you then buy, which affiliate referred the purchase. If you take part in the affiliate program yourself, your referral code and your commission and payout records.