Set the URL in Dashboard → OTP Settings. The signing secret is shown when you save or rotate.
Headers
X-OraRepot-Signature: sha256=<hex>
X-OraRepot-Event: otp.sentBody
{
"id": "evt_01J…",
"event": "otp.sent",
"request_id": "req_01J…",
"to": "+628123456789",
"template": "otp_login",
"created_at": "2026-08-25T03:00:00.000Z"
}