Exclude multiple categories from the Google Product Feed

functions.php

<?php

function lw_gpf_exclude_product( $excluded, $product_id, $feed_format ) {
    // return TRUE to exclude this product
    // return FALSE to include this product

    // return $excluded to keep the standard behaviour for this product.
    return $excluded;
}

add_filter( 'woocommerce_gpf_exclude_product', 'lw_gpf_exclude_product', 11, 3 );