_onWSNotification (arrN) {
    const status = arrN[6]
    const msg = arrN[7]

    if (!arrN[4]) return

    if (arrN[1] === 'on-req') {
      const [,, cid] = arrN[4]
      const k = `order-new-${cid}`

      if (status === 'SUCCESS') {
        this._eventCallbacks.trigger(k, null, arrN[4])
      } else {
        this._eventCallbacks.trigger(k, new Error(`${status}: ${msg}`), arrN[4])
      }
    } else if (arrN[1] === 'oc-req') {
      const [id] = arrN[4]
      const k = `order-cancel-${id}`

      if (status === 'SUCCESS') {
        this._eventCallbacks.trigger(k, null, arrN[4])
      } else {
        this._eventCallbacks.trigger(k, new Error(`${status}: ${msg}`), arrN[4])
      }
    } else if (arrN[1] === 'ou-req') {
      const [id] = arrN[4]
      const k = `order-update-${id}`

      if (status === 'SUCCESS') {
        this._eventCallbacks.trigger(k, null, arrN[4])
      } else {
        this._eventCallbacks.trigger(k, new Error(`${status}: ${msg}`), arrN[4])
      }
    }
  }
@param {Array} arrN - notification in ws array format
@private