Listening all states of order change: sales_order_save_after: What's the best event/way to listen for all order state changes in Magento 2?. There are some default states: new, pending_payment, processing, complete, closed, canceled, holded, payment_review.

For shipment event, we can use: sales_order_shipment_save_after

Listening all states of order change: sales_order_save_after: What's the best event/way to listen for all order state changes in Magento 2?. There are some default states: new, pending_payment, processing, complete, closed, canceled, holded, payment_review.

For shipment event, we can use: sales_order_shipment_save_after