A subscriptions request will provide a response with a list of all current subscriptions for the client.
Optional cidRequests may optionally provide a cid parameter to identify the request a response should be associated with.
onResponse callback object will include the provided cid as a property.Optional marketsA top-level markets array can be used to allow multiple subscriptions to inherit this array without having define them themselves.
markets parameter, it will inherit the top-level
markets array provided here.
Requests all current subscriptions active on the WebSocket session.