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Subscribe with {"method":"subscribe","subscription":{"type":"webData2","user":"0x..."}} (user required). Acknowledgement uses subscriptionResponse; pushes use WebData2Update with the HL webData2 payload (positions, balances, open orders…).

Aggregate account snapshot for the subscribed user (HL webData2 shape).

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channel
enum<string>
required
Available options:
webData2
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data
object
required