Программно получить order transitions workflows

  /** @var \Drupal\state_machine\WorkflowManager $workflow_plugin_manager */
  $workflow_plugin_manager = \Drupal::service('plugin.manager.workflow');

  $orderTypes = \Drupal\commerce_order\Entity\OrderType::loadMultiple();

  $workflowTransitions = []
  /** @var $orderType \Drupal\commerce_order\Entity\OrderType */
  foreach ($orderTypes as $orderType) {
    $workflowTransitions[$orderType->id()] = $workflow_plugin_manager->createInstance($orderType->getWorkflowId())->getTransitions();
  }