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GET 
/api/sessions/:sessionId/channels

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Request

Responses

200

List of subscribed channels

400

Session not ready

409

The session is not connected — an engine exists for it but is not ready: disconnected, reconnecting, or still initializing, so the request never reached WhatsApp. Wait for ready and retry. A session that was never started answers 400 instead, and the session lifecycle routes answer 409 for a conflicting state rather than this. One window answers this while the session still reads ready: WhatsApp Web periodically reloads its own page and the engine re-injects into it — for those few seconds the answer is a 409 naming the reload; retry shortly.

501

Not supported by the active engine: the Baileys adapter cannot list subscribed channels.