WHMCS Integration and SSL Certificates Breaks Install

I am trying to get the account page to work on my multisite install. I just need it to work on the root domain name. When I am logged into the backend and click the register link, I see this page and it works fine for registering:

/whmcsportal/register.php/?

When I am not logged into the backend, I see this URL and it doesn't work for registering:

/whmcsportal/register.php/?systpl=portal

We figured out that it is an SSL issue. We are trying to get the SSL URL into the 3 places noted in this discussion: https://premium.wpmudev.org/forums/topic/ssl-in-whmcs-integration-plugin

When we change the 3 URLs in WHMCS it breaks the installation.

Can someone please help me figure out how to correctly get an SSL working for the WHMCS integration plugin so we can only see the URL /whmcsportal/register.php/? and have it working for signups?