Where is the order submission file in the database in WooCommerce?

Question

WordPress

Where in WooCommerce is the file for submitting an order to the database?

Answer 1

Specify what needs to be done with the order? You should not change plugin files, you need to use filters and hooks. All of them are described in the documentation
once https://docs.woocommerce.com/wc-apidocs/index.html
and twice https://docs.woocommerce.com/wc-apidocs/hook-docs.html
WC_Order::save()
But before calling this method, there is at least a change in the status of the order and the corresponding hooks