I am using cpanel xml api.
https://github.com/CpanelInc/xmlapi-php
i can create subdomains and delete them.
Now i want to list the subdomains.
Here is the Answer in API1 level
$listSubdomain = $xml->api1_query( $cp_un, 'SubDomain', 'listsubdomainsop');
$listSubdomainpaths = $xml->api1_query( $cp_un, 'SubDomain', 'cplistsubdomains');