What is the filter hook for custom fields content?

The following code hides “the_content” output

add_filter( "the_content", "cp_module_pcontent_post_content" );
function cp_module_pcontent_post_content($content){
        global $post;
        global $cp_module_pcontent_hide;
        if(!in_array($post->ID,(array)$cp_module_pcontent_hide)){
            return $content;
        }
        $c = '<p>' . get_option('cp_module_pcontent_text_pay') . '</p>';
        $c .= apply_filters('cp_module_pcontent_post_content_'.$post->ID, '');
        $c .= '<form method="post">';
        $c .= '<input type="hidden" name="cp_module_pcontent_pay" value="'.$post->ID.'" />';
        $c .= '<p><input type="submit" value="'.get_option('cp_module_pcontent_text_button').'" /></p>';
        $c .= '</form>';
        if(!is_user_logged_in()){
            $c = get_option('cp_module_pcontent_text_logout');
        }
        $c = str_replace('%points%',cp_formatPoints(get_post_meta($post->ID,'cp_pcontent_points', 1)),$c);
        return $c;
    }

Check these screenshots.

If the user not logged in it display this

If the user logged in it display like this

Please note only the_content output is hidden

Here is my problem. I’m using magic fields plugin. It is a plugin to create custom fields.

For example this is the code my single.php file using.

    <div class="entry-content">
            <?php the_content(); ?>
    </div>

 <!-- magic fields plugin code starts -->
    <div class="custom-content">
            <?php if (function_exists('get_field')) { 
                    $requirements = get_field('requirements_requirements');
                        if($requirements){  
                            foreach($requirements as $requirement){
                            echo $requirement;
                            } 
                        } 
                    } ?>

    </div>
  <!-- magic fields plugin code ends -->

Magic fields plugin output are not hidden here
I want to hide those Magic fields plugin output instead of the_content output. I mean requirements instead of the_content.

When i replace “the_content” with “the_title” it hides the title.

For example like this

add_filter( “the_title”, “cp_module_pcontent_post_content” ); //hides title

add_filter( “the_tags”, “cp_module_pcontent_post_content” ); //hides tags

add_filter( “wp_list_categories”, “cp_module_pcontent_post_content” ); //hides categories

add_filter( “???????”, “cp_module_pcontent_post_content” ); //hides magic fields group

To hide those requirements I need to replace

add_filter( "the_content", "cp_module_pcontent_post_content" );

to

add_filter( "xxxxxxxx", "cp_module_pcontent_post_content" );

Can you tell me what is that xxxxxxxx?

Thanks