auth.wallet_address. Keep the API Secret local. See Broker WebSocket authentication.
Subscribe
Use the channel prefixpred. A single item can be subscribed with items, or all private updates can be selected with all: true.
op: "unsubscribe". If the connection has been authenticated with server.sign, later subscriptions and unsubscriptions can omit auth.
pred.orders
Order state changes for the authenticated account.
status is an uppercase upstream UI state, separate from the five lowercase REST order states. Examples include PROCESSING, OPEN, CANCELLING, MATCHED, CANCELED, and FAILED.