There may be some scenarios that it would be beneficial to store some data on an order. You could make a field on the order, but perhaps that is overkill or not appropriate for your use case.
Just like in commerce 1.x, in commerce 2.x you can store miscellaneous data as a key/value pair.
$order->setData('unique_key', 'value'); // Depending where you are setting data, you may need to call: // $order->save(); ... echo $order->getData('unique_key'); // 'value'
Found errors? Think you can improve this documentation? edit this page