Optional ReadonlydataReadonlypolicyReadonlysubscriptionReadonlyendpoint: stringReadonlykeys: { auth: string; p256dh: string }Readonlyauth: stringAuth secret. Base64 encoded string of 16 bytes of random data.
Readonlyp256dh: stringUser agent public key. Base64 encoded string of public key of ECDH key using prime256v1 curve.
Endpoint URL that is called when a notification event occurs.