# Subscriptions (WebSocket)

Receive **real-time updates** from Fondo without polling.
- **WebSocket:** open a persistent stream for `.create`, `.update`, `.delete`, and `heartbeat` events.
- **Journey callbacks:** Fondo sends HTTP POST updates to the `callbackUrl` you provide when creating a journey.
Include replay/retry handling in your consumers.

 - [GET /v2/partner/client/{clientId}/subscribe](https://docs.fondo.se/openapi/api/subscription/getwebsocket.md): **This is a WebSocket endpoint, not a regular HTTP GET.** A plain `GET` against this path returns `404`. The client must perform the WebSocket opening handshake (`Upgrade: websocket`, `Connection: Upg