Thank you very much for your answer.
I had the problem that you were marking me with doing it through a short code, so I am doing it as a template.
I never did it this way, it marks me an error and I don’t know what it is.
In the loop I have the following:
<?php while ( have_posts() ) : the_post(); ?>
<?php if (is_user_logged_in() && current_user_can('cliente')) : ?>
<?php $current_user_id = get_current_user_id(); ?>
<?php $args = array(
'post_type' => 'clientes',
'author' => $current_user_id
); ?>
<?php $posts = get_posts($args); ?>
<?php if ($posts)
$post_id = $posts[0]->ID;
?>
: ?>
<?php endwhile; ?>
