Autocomplete orders in WooCommerce

autocomplete-orders.php

<?php
/**
 * Autocomplete orders in subscription.
 *
 * @package CustomWoo
 */

declare( strict_types=1 );

namespace Custom\Woo\Extras;

if ( ! defined( 'ABSPATH' ) ) {
	return;
}

add_action( 'woocommerce_payment_complete', __NAMESPACE__ . '\\woocommerce_subscriptions_auto_complete_order', 999 );
/**
 * Autocomplete orders.
 *
 * @param int $order_id Order Id.
 */
function woocommerce_subscriptions_auto_complete_order( $order_id ) {
	if ( ! $order_id ) {
		return;
	}
	$order = wc_get_order( $order_id );
	$order->update_status( 'completed' );
}