Restrict access to certain pages based on a user meta value.

my_pmpro_has_membership_access_filter.php

/*
	Users with the upsell usermeta have access to everything.
*/
function my_pmpro_has_membership_access_filter($hasaccess, $mypost, $myuser, $post_membership_levels)
{
	$upsell = $myuser->upsell;
	if(!empty($upsell))
	{
		//could also check that $mypost is a specific page or in a specific group of pages here
		$hasaccess = true;
	}
	
	return $hasaccess;
}
add_filter('pmpro_has_membership_access_filter', 'my_pmpro_has_membership_access_filter', 10, 4);