function wpf_send_upsell_details( $order, $event, $result ) {

    $order_id = $order->get_id();

    wp_fusion()->integrations->woocommerce->woocommerce_apply_tags_checkout( $order_id, true, true );

}

add_action( 'wc_1cu_combined_order_payment_processed', 'wpf_send_upsell_details', 10, 3 );