One of the many things web visitors check is a site's SSL certificate. If you want to have your sign-up page secured follow the instructions below.
Your domain yourcompanyname.ositracker.com. This is already a secured link included in your package.
To make your custom affiliate sign-up page secured, please register an SSL certificate, like namecheap.com.
Send it to email@example.com and indicate the request for a secured custom affiliate link.
You may also refer to this article for additional option: