wanze

<?php

use Drupal\commerce_google_tag_manager\Event\AlterEventDataEvent;

class AlterShippingData implements EventSubscriberInterface {

  public static function getSubscribedEvents() {
    return [
      'commerce_gtm_enhanced_ecommerce.alter_event_data' => 'addShipping'
    ];

wanze

use Drupal\commerce_google_tag_manager\Event\TrackCheckoutStepEvent;

<?php

class CheckoutOptionSubscriber implements EventSubscriberInterface {

  public static function getSubscribedEvents() {
	  return [
      'commerce_google_tag_manager.track_checkout_step' => 'trackUser'
    ];

wanze

<?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'
    ];