Post-trade events in real time — quote acceptances and confirmations, position creation and settlement. Authenticate after connecting with {"type":"auth","api_key":""}, then subscribe with {"type":"subscribe","channel":"..."}. Missed events are not redelivered; reconcile via REST reads on reconnect. Keep-alive via {"type":"ping"} / {"type":"pong"}. Early-cashout buyback (position.bought_back) is NOT delivered on this channel — webhook-only.
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