Your message bodies stay out of the backend.
Page Me stores the minimum delivery metadata needed to make private webhook notifications reliable.
What the server stores
APNs device token, device metadata, user entitlement state, channel names, secret digests, delivery status metadata, timestamps, and error codes.
What the server does not store by default
Raw webhook secrets, raw app session tokens, notification title/message bodies, or local notification history.
Local history
Notification history is written on-device by the Notification Service Extension and can be cleared from the app.
Account deletion
The iOS app can delete the Page Me account from Settings. This disables registered devices, deletes active channels, revokes app sessions, marks the server account deleted, and clears local history on the iPhone.