Cron transfer Gravity Forms entries with Web API

Situation:
Two separate servers with Gravity Forms installed.
One is publicly accessible, the other is used internally and not accessible to the public.

When a user submits a form on the public site, the form is sent via the gravity forms WebAPI to the internal site.

We would like to use a cronjob on the public site to:
– check if there are new form entries of a form
– loop through the entries and
– transfer the entries to the internal site
– delete each entry after succesful transfer

I’ve tried searching for similar solutions but haven’t been able to find much on the subject and would appreciate pointers and tips to start me off in the right direction.

Bonus question:
– I would like to transfer files uploaded through the form as well
– When an entry can’t be uploaded, I would like to show this in a field in the entry which hasnt been uploaded.

I realise this is a big question, but am having a hard time getting started and would really appreciate any input.