allowedDomains property

Domains or subdomains of websites allowed to use the key.

All subdomains of an allowed domain are automatically allowed. A valid domain requires a host and must not include any path, port, query or fragment. Examples: 'example.com' or 'subdomain.example.com' Each key supports a maximum of 250 domains. To use a key on more domains, set allow_all_domains to true. When this is set, you are responsible for validating the hostname by checking the token_properties.hostname field in each assessment response against your list of allowed domains.

Optional.