Atmos API acdp.admin.endpoint property

I am using atmos java api and trying to create atmos account via api. Please, can you explain me what this property "acdp.admin.endpoint" is for?

InputStream in = ClassLoader

                .getSystemResourceAsStream("atmos.properties");

        if (in != null) {

            try {

                System.getProperties().load(in);

            } catch (IOException e) {

                throw new RuntimeException("Could not load atmos.properties", e);

            }

        }

        acdpEndpoint = System.getProperty("acdp.admin.endpoint");

        if (acdpEndpoint == null) {

            throw new RuntimeException(

                    "acdp.admin.endpoint is null.  Set in atmos.properties or on command line with -Dacdp.admin.endpoint");

        }

Thank you.