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- Stored, for each browser where you turn them on: its push address (a web address at your browser's push service, such as Google, Mozilla, Apple or Microsoft) and its encryption keys, which notifications you want and the language to write them in.
- Sent through that push service, encrypted so it cannot read it: a title, a short text with the other player's name as they typed it, and the link to open. Never scores, face data or anything else.
- Identity: like matches, your anonymous ID or your account while you are signed in. Signing out turns notifications off in this browser.
- Kept until you turn them off, delete your data or account, or the browser drops the address. One that has neither taken a notification nor been renewed (opening this screen renews it) for 12 months is deleted.