"Client ID is not found" when whois via api

[tkaprol]

When we are trying to do whois query with api, we get "Client ID is not found" error message.

 

Here is the data what i sent:

 

$postfields["username"] = $username;

$postfields["password"] = md5($password);

$postfields["action"] = "domainwhois";

$postfields["domain"] = $domain; // whole domain like whmcs.com