DNS support for API requests
The WHMCS API access restriction works well with IP's, but not with DNS. For example, we use AWS Elastic Beanstalk DNS names to provide load balancing/redundancy. When such DNS path is used, the API does not accept it. The current settings force us to list IP's, and limiting performance to static IP used, not dynamic IP's hidden behind DNS names. I suggest you add this feature to WHMCS.