All classes that implement TokenInterface in Courier 8
- class \Drupal\courier\ChannelBase implements ChannelInterface uses TokenTrait
- class \Drupal\courier\Entity\Email implements EmailInterface
- class \Drupal\courier\Entity\TemplateCollection implements TemplateCollectionInterface uses TokenTrait
- class \Drupal\courier_test_message\Entity\TestMessage implements TestMessageInterface