DNSOnly api connection through a production Cpanel server - ANY DOCUMENTATION OUT THERE?

I have 8 Cpanel production servers linked into 6 Cpanel DNS ONLY which are all clustered together. What I want to do is this: 1. create an external PHP application (ie my own API) that connects to the DNSonly system through one of the production server 2. query the cluster DNS to get a list of domains 2. Send DNS settings to the cluster (through the production server) for example A records, delete zones, add zones etc. I "don't think" its possible to connect directly to the DNSonly servers (which is odd anyway) so do I need to connect to one of my normal servers via API and make the updates there?