Batch-resolve profile picture URLs for up to 50 contacts

GET 
/api/sessions/:sessionId/contacts/profile-pictures

One request for a whole chat sidebar — avoids the burst of parallel single fetches that would exhaust the per-IP throttle. Engine lookups run 5 at a time; per-id failures return null.

Request

Responses

200

Picture URL per requested id

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.