CentralNic Reseller provides his products and services through a Backend System that is accessible by different options. One of these options is a HTTP API for which we provide a SDK just in PHP, more to come (nodejs, go, …). You may use this connector library to connect your systems/frontends to the HEXONET Backend System.
Find our Backend System API well documented here (see HTTPS socket) and the command reference here.
Whenever you need to know details about an API Command and its API Response, have a read there.