If you are using your own custom domain for your OSI Affiliate software account like partners.yourdomain.com instead of yourdomain.ositracker.com, you can use the Cloudflare DNS Free plan and make your custom domain secure.
Once you sign up your Cloudflare account, follow the steps below to make your custom domain secure.
Step 1. Log in to your Cloudflare account portal here:
Step 2. Add your domain to Cloudflare and update your domain name server addresses by following the instructions here: Creating a Cloudflare account and adding a website
Step 3. Go into your site profile and click on the DNS tab.
Step 4. Click the Add Record button.
Step 5. Select CNAME from the Type dropdown and enter the name of your subdomain and your original OSI Affiliate URL.