Hi @pb1646a - if I understand your question correctly, the answer is yes: the authentication requirements are similar for premium and enterprise access.
If you haven’t done so already, you may be interested in reviewing our documentation, where you can find more detail on the premium and enterprise versions of the Account Activity API, as well as the authentication required for each of the endpoints available. Details on the different authentication types can be found here.
Could you tell us a bit more about your use case? Why are you looking to authenticate without user-authentication tokens?
Please also note that we no longer offer the DM-only version of the product. The Account Activity API is a realtime product, so you will only be able to get the Tweets and Followers of a @handle in realtime and not their historical data. If you’re interested in pulling historical data, you can use the Search API and/or the GET followers/ids and GET followers/list endpoints.
If you’re interested in enterprise access, please get in touch with our Sales team using this form.