{"endpoints":["POST /wake  (json body + Authorization header)","POST /register/challenge, /register/confirm, /register/revoke  (per-install capability)","/toxfcm/fcm.php?id=<fcm_token>&type=1  (deprecated: credentials in the URL)"],"privacy":"wake-only, no message content; optional sender public key via &from=","service":"khandaq-push-relay"}