Redirect Loop on integration with WHMCS set with HTTPS

Most of client set their WHMCS with https:// URL in both non ssl and ssl URL fields in WHMCS > settings > general tab. You should use HTTPS only in SSL URL field.

Once you set the correct values in WHMCS, do not forget to do following steps.

1. re-sync WHMpress
2. Select SSL/HTTPS URL in WHMpress > Settings
3. Save settings (even if you have not changed any thing).