RE-DIRECTING TO REGISTER Based on Permissions

[MacroPhotoPro]

Hi;

I have created custom pages that I only want subscribed (paying) members to be able to view.

If an unregistered/registered member (who has not paid) tries to view, I have created a re-direct with the following code:

// Permissions Redirect
	if ($usergroupid==8) {
		header("Location: $url_register");
	} else if ($usergroupid <= 1) {
		header("Location: $url_register");
	} else if ($usergroupid <= 2) {
		header("Location: $url_payments");
	} else if ($usergroupid <= 3) {
		header("Location: $url_payments");
	} else if ($usergroupid <= 4) {
		header("Location: $url_payments");
	}

User Group 1 = Unregistered;
User Group 2 = Registered;
User Group 3 = Awaiting Email;
User Group 4 = In Moderation;

However, the page is not redirecting properly.

What am I doing wrong in my coding?

Any help would be very much appreciated,

Jack

--------------- Added [DATE]1428650994[/DATE] at [TIME]1428650994[/TIME] ---------------

Someone PM'd me this coding, and it works, but unfortunately it directs every user group to register:

if (!$vbulletin->userinfo['userid'] AND THIS_SCRIPT != 'register')
{
	header("Location: " . $vbulletin->options['bburl'] . "/register.php");
}

How do I code it to be specific, to one (or more) select user groups?

Would appreciate some help