Code-Snippets-Functions/Execute a function on a child site/WooCommerce/allow-search-using-billing-email-in-admin-orders-list.txt

add_filter( 'woocommerce_shop_order_search_fields', 'extending_admin_orders_search_field', 10, 1 );
function extending_admin_orders_search_field( $meta_keys ){
    $meta_keys[] = '_billing_email';
    $meta_keys[] = '_billing_phone';
    $meta_keys[] = '_payment_method_title';

    return $meta_keys;
}