commerce_google_tag_manager: Example implementation of an AlterProduct event subscriber

AlterProductSubscriber.php

<?php

use Drupal\commerce_google_tag_manager\Event\AlterProductEvent;

class AlterProductSubscriber implements EventSubscriberInterface {

  public static function getSubscribedEvents() {
    return [
      'commerce_gtm_enhanced_ecommerce.alter_product' => 'alterProduct'
    ];
  }

  public function alterProduct(AlterProductEvent $event) {
    // The Commerce product variation entity.
    $productVariation = $event->getProductVariation();

    // The product represented in Enhanced Ecommerce.
    $product = $event->getProduct();

    // Set the ID to the title of the product.
    // Set the name to the value of the field "field_title".
    $product
      ->setId($productVariation->getProduct()->getTitle())
      ->setName($productVariation->getProduct()->get('field_title')->value);
  }
}