Moralis In-Game Login from Native PC Client

Looking to clear up some ambiguity surrounding cross-platform login of users without the use of WebGL or a browser pop-up.

Is it possible to interact with Moralis’ user authentication, though username and password, without the need to prompt a user to login via the browser. For clarification our Unity App is currently a Native PC Client and we are trying to avoid browser interaction due to the VR nature of the game.