Account details (email) via Amazon Cognito when you sign up; subscription and billing details via Stripe (we never see your card number); basic usage events such as page views and episode plays to understand what people watch; and, for account security and fraud prevention, technical logs (IP address, browser type, timestamps) tied to sign-in and payment activity. Usage events are kept for up to 180 days and security logs tied to payments for up to one year, then deleted automatically.