mailjet-8.x-2.7/modules/mailjet_stats/mailjet_stats.services.yml

services:
  init_subscriber:
    class: Drupal\mailjet_stats\EventSubscriber\InitSubscriber
    tags:
      -
        name: event_subscriber
  stats.order_complete::
    class: Drupal\mailjet_stats\EventSubscriber\OrderCompleteSubscriber
    arguments: ['@entity_type.manager']
    tags:
      -
        { name: event_subscriber }