php - Add custom functionality on WooCommerce complete button -

i've situation add data database tables on order status completed button.

i can see url in class-wc-admin-post-types.php

can me hook? or how admin-ajax.php works? have add status of mine custom database tables.

this code fire customer's order set completed..

add_action( 'woocommerce_order_status_completed', 'custom_task' ); function custom_task( $order_id ) {      // continue if have $order_id     if ( ! $order_id ) {         return;     }      // order     $order = wc_get_order( $order_id );      // thing  }