{
  "id": 42,
  "jsonrpc": "2.0",
  "method": "private/subscribe",
  "params": {
    "channels": [
      "user.position_lock"
    ]
  }
}

{
  "jsonrpc": "2.0",
  "method": "subscription",
  "params": {
    "channel": "user.position_lock",
    "data": {
      "locked": true
    }
  }
}