materio-d9/web/modules/custom/materio_mailjet/materio_mailjet.routing.yml

materio_mailjet.webhook:
  path: '/materio_mailjet_webhook'
  defaults:
    _controller: 'Drupal\materio_mailjet\Controller\MaterioMailjetWebhookCallbackController::callback'
    _title: 'Event callback'
  requirements:
    _access: 'TRUE'