For invoicing I try to get the hosting information via de API. I now the client_ids but I don't know what client has what domain. I the database I found the relation table sys_group. But how can I do that via the API? With client_get_all I can get all the client_ids, with client_get(client_id), I can get the specific client information. With the client_id I can get the related groupid and with the groupid I can get the related domain_ids. And with sites_web_domain_get(domain_id) I have the domain information. In the database the relation between client and site is linked via the table sys_group. But how can I find this relation via the API?