If you want to access a repository from a server for deployment, if you want to commit from a shared server or if you want to create a script to access the Phabricator API, you can use a //Bot user//.
Bot user are created and configured from the Administrators, you can [[https://c4science.ch/maniphest/task/edit/form/9/ | ask for a Bot using the request form]].
More information on the [[https://secure.phabricator.com/book/phabricator/article/users/ | Phabricator documentation]] and #bot_users