add_action('init', 'reset_product_ids');

function reset_product_ids() {

    if(isset($_GET['woo_reset_wpf_product_ids'])) {

        $args = array(
            'numberposts' => -1,
            'post_type'   => 'product',
            'fields'      => 'ids',
            'meta_query'  => array(
                array(
                    'key'     => wp_fusion()->crm->slug . '_product_id',
                    'compare' => 'EXISTS'
                )
            )
        );

        $products = get_posts( $args );

        foreach( $products as $product_id ) {
            delete_post_meta( $product_id, wp_fusion()->crm->slug . '_product_id' );
        }

    }

}