i dont know how to integrate the plugin pay per view.

i dont know how to integrate the plugin pay per view.
i have to protect dynamic fields directly on template files.
i used wp job manager and wanted protect some fields.

For example in my template file i have this which i would like protect:
<div class="salary">Salary : <?php echo get_post_meta($post->ID, '_job_salary', true); ?> €</div>
<div class="contact">Contact : <?php echo get_post_meta($post->ID, '_job_contact', true); ?> €</div>

how can i protect it ?

thanks