Exibir campo de CPF nos pedidos do WCFM no painel do vendedor

functions.php

<?php
add_action( 'wcfm_order_details_after_shipping_address', function( $order ){

    $cpf = $order->get_meta( '_billing_cpf' );
    ?>
    <div><strong>CPF:</strong> <?php echo esc_html( $cpf ); ?></div>
    <?php

} );