Restricts all posts for CPT campaign. Only users with a level can view regardless of what is set in the "Require Membership" box.

restrict_all_posts_for_cpt.php

<?php

// Copy from below here...

/*
 * Restricts all posts for CPT campaign. Only users with a level can view
 * regardless of what is set in the "Require Membership" box.
 *
 * Can change 'campaign' on line 12 to any CPT.
 */
function my_pmpro_has_membership_access_filter( $hasaccess, $post ) {
	if ( 'campaign' != $post->post_type || false === $hasaccess ) {
		return $hasaccess;
	}
	return pmpro_hasMembershipLevel();
}
add_filter( 'pmpro_has_membership_access_filter', 'my_pmpro_has_membership_access_filter', 5, 2 );