<?php

function lw_woocommerce_gpf_feed_item_google( $feed_item, $product ) {
    // If you need to modify the prices sent in the feed, you can modify the following
    // properties of the feed_item object.
    // $feed_item->sale_price_ex_tax
    // $feed_item->sale_price_inc_tax
    // $feed_item->regular_price_ex_tax
    // $feed_item->regular_price_inc_tax
    return $feed_item;
 }
 add_filter( 'woocommerce_gpf_feed_item_google', 'lw_woocommerce_gpf_feed_item_google', 10, 2 );