MailPoet: subscribe and unsubscribe a list

mailpoet_helpers.php

<?php
function mailpoet_subscribe($list_ids = array()) {
  $current_user = wp_get_current_user();
  
  $helper_user = WYSIJA::get('user','helper');
  $helper_user->addSubscriber([
    'user' => [
      'email' => $current_user->user_email,
      'firstname' => $current_user->user_firstname,
      'lastname' => $current_user->user_lastname     
    ],
    'user_list' => [
      'list_ids' => $list_ids
    ]
  ]);
}
function mailpoet_unsubscribe($list_ids = array()) {
  $current_user = wp_get_current_user();
  $model_user = WYSIJA::get('user','model');
  $subscriber_data = (array)$model_user->getOne(false, ['email' => $current_user->user_email]);
  if (isset($subscriber_data['user_id'])) {
    $helper_user = WYSIJA::get('user','helper');
    $helper_user->removeFromLists($list_ids,[$subscriber_data['user_id']]);
  }
}