"On user deletion delete the Billwerk Customer" option does not work

Eventually this is just blocked by billwerk and we should instead lock the customer and the contract, if it's not possible to delete it.

I can confirm this still doesn't work and there are not even log entries in this case. Maybe the user delete hook doesn't work?

This is the current implementation in billwerk_subscriptions_handler_default.module:

/**
 * Implements hook_entity_TYPE_delete().
 */
function billwerk_subscriptions_handler_default_entity_user_delete(UserInterface $user) {
  $onDrupalUserDelete = \Drupal::config('billwerk_subscriptions_handler_default.settings')->get('on_drupal_user_delete');
  if (!empty($onDrupalUserDelete)) {
    try {
      $subscriber = Subscriber::load($user);
      if ($subscriber->hasUserBillwerkContractId()) {
        switch ($onDrupalUserDelete) {
          case 'lock':
            $subscriber->billwerkLockCustomer();
            break;

          case 'delete':
            $subscriber->billwerkDeleteCustomer();
            break;

        }
      }
    }
    catch (\Exception $e) {
      // Log exception:
      Error::logException(\Drupal::logger('billwerk_subscriptions_handler'), $e);
      // Show error message:
      // For now do not show the error to the user, as it might be confusing or
      // even risky.
      // @see https://www.drupal.org/project/billwerk_subscriptions/issues/3439472:
      // \Drupal::messenger()->addError($e->getMessage());
    }
  }
}