Authentication for service using REST API

[mahj]

I want to develop an unattended service that regularly retrieves data from a third-party source and adds it to a secure feature service in our ArcGIS Online organization using ArcGIS REST API.

From a licensing point of view, can I just use my Named User (Creator) in the service to login to ArcGIS Online to access the secure feature service? Or do I need to create a specific Named User in my organization for the service? Or can I use an API Key created with my Named User? Or is this scenario not allowed?

[mahj · Accepted solution]

For others that might have the same question, I've found the answer in the Product-Specific Terms of Use in footnote 23: