materio-d8/web/modules/custom/materio_commerce/src/EventSubscriber/MaterioCommerceOrderEventsSubscriber.php

<?php
// https://docs.drupalcommerce.org/commerce2/developer-guide/orders/workflows/react-to-workflow-transitions

namespace Drupal\materio_commerce\EventSubscriber;

use Drupal\commerce_order\Event\OrderEvent;
use Drupal\commerce_order\Event\OrderEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Class EntityTypeSubscriber.
 *
 * @package Drupal\custom_events\EventSubscriber
 */
class MaterioCommerceOrderEventsSubscriber implements EventSubscriberInterface {

  /**
   * {@inheritdoc}
   *
   * @return array
   *   The event names to listen for, and the methods that should be executed.
   */
  public static function getSubscribedEvents() {
    return [
      OrderEvents::ORDER_PAID => 'onOrderPaid'
      // OrderEvents::ORDER_CREATE => 'onOrderCreate'
      // 'commerce_order.order.paid' => ['onOrderPaid', -100]
    ];
  }

  public function onOrderPaid(OrderEvent $event) {
    $order = $event->getOrder();
    $customer = $order->getCustomer();
    
    foreach ($order->getItems() as $order_item) {
      // Skip order items that do not have a license reference field.
      // We check order items rather than the purchased entity to allow products
      // with licenses to be purchased without the checkout flow triggering
      // our synchronization. This is for cases such as recurring orders, where
      // the license entity should not be put through the normal workflow.
      // Checking the order item's bundle for our entity trait is expensive, as
      // it requires loading the bundle entity to call hasTrait() on it.
      // For now, just check whether the order item has our trait's field on it.
      // @see https://www.drupal.org/node/2894805
      if (!$order_item->hasField('license')) {
        continue;
      }
      $purchased_entity = $order_item->getPurchasedEntity();
      // This order item isn't "licensable" if the purchased entity it
      // references isn't properly configured.
      if (!$purchased_entity->hasField('license_type') || $purchased_entity->get('license_type')->isEmpty()) {
        continue;
      }

      $sku = $purchased_entity->getSku();
      switch ($sku) {
        case 'web-monthly':
        case 'web-annual':
          $member_type = 0;
          break;
        case 'web-showroom-monthly':
        case 'web-showroom-annual':
          $member_type = 1;
          break;
      }
    }

    if(isset($member_type)){
      $customer->set('field_member_type', $member_type);
      $customer->save();
    }
    // \Drupal::messenger()->addStatus('HAHA Order '.$order->getOrderNumber().' paid: ' . $customer->getEmail());
  }

  // public function onOrderCreate(OrderEvent $event) {
  //   $order = $event->getOrder();
  //   $customer = $order->getCustomer();
  //   \Drupal::messenger()->addStatus('HAHA Order '.$order->getOrderNumber().' created: ' . $customer->getEmail());
  // }

}