By default, subdomains and apex or naked domains are considered unique in CrowdHandler.
Practically this means that an integration setup for subdomain www.example.com will only accept traffic for www.example.com and will not accept traffic for example.com, shop.example.com or any other variation.
If you do require CrowdHandler protection against multiple variations of your domain, our professional plan and higher tiers, provide the ability to set up multiple domains.
Integrating with Apex, Naked or Root Domains
Integrating with a root domain, such as example.com, requires that your DNS hosting provider provides the necessary functionality (often referred to as ANAME records or CNAME flattening).
The following resources may be helpful in understanding these processes: