Expanded class hierarchy of PromotionInterface in Commerce Core 8.2
- interface \Drupal\Core\Entity\ContentEntityInterface extends \Drupal\Core\Entity\Traversable; interface \Drupal\commerce_store\Entity\EntityStoresInterface; interface \Drupal\Core\Entity\EntityChangedInterface; interface \Drupal\user\EntityOwnerInterface
- interface \Drupal\commerce_promotion\Entity\PromotionInterface