There are a number of improvements that have been made to the HEtzner, DOMAIn robot API as shown here
https://help.internetx.com/display/APIJSONEN/Domain+Robot+JSON+API
which is now available in JSON

1) Addition of Automatic SSL issuing. (FREE 1 year SSL)
All domains registered to internet are eligible for a free SSL certificate for up to 5 SANS, the issuance and management of the same has been added onto the API

2) DNS management.
internetx provides a complete DNS management experience for adding and editing various DNS records through their API. this will enable the management of DNS records for customer domains, without the need to have to create a free panel account just for DNS records. that is a wastage of resources, considering the new billing system per account.

If a customer only orders domain, no need to offer a free panel account for DNS, as this is done from the autodns domain robot API offered by internetx.