async logout () {
    return await this._fetch({
      method: 'POST',
      url: '/account/logout',
      body: {}
    })
      .then((res) => {
        if ((res.status === 200 || res.status === 201) ||
            (res.status === 400 && res.code === 209)) {
          return {}
        } else {
          throw new Error({code: res.statusCode, error: res.message})
        }
      })
      .catch((error) => {
        throw (error)
      })
  }
### logout
prepare the request and call _fetch