How do I send notifications about order status changes?

Imagine that a customer made a purchase on Woocommerce, and your order has a status of “processing”.

Then the store sends the order and changes the status to “shipped”.

It would be great if the customer received a notification about this status change.

This would be a great advantage, as today there are more than 5 million stores using woorommerce, and these stores have to be content with email notifications only.

If you offered this feature, surely millions of users would install your plugin.