oAuth authentication, 2-leg?

First, if the answer is really obvious and I am missing something I apologize. I have a few api’s that I would like to use as service accounts. Below are two examples, Moxtra & Podio. I have successfully got a user-agent flow working for both, and a password flow working for the podio api, however, I would prefer on both to use a service workflow for both so that I do not have to tie api calls to specific users. Is this possible with the current version of the API connector?