Making Cost of Goods plugin compatible with the WC REST API

functions.php

<?php 

// add the code below to your functions.php file

function my_custom_insert_shop_order_object( $order ) {
  if( function_exists('wc_cog') ) {
    $WC_COG = wc_cog();
    $WC_COG->set_order_cost_meta( $order->get_id() );
  }
}

add_action('woocommerce_rest_insert_shop_order_object', 'my_custom_insert_shop_order_object');