How to load an order entity

If you wan to get some info from ORDER entity there is a method to do that.  We can do that by loading by some property or by loading order per ID

$orders= \Drupal::entityTypeManager()->getStorage('commerce_order')->loadByProperties(['order_id' => '233136']);
$order= reset($orders);

or just

$order= \Drupal::entityTypeManager()->getStorage('commerce_order')->load('233136');

and then call some method on this entity and check/do what you need.