Hello! Thanks for contacting us! I will go on the hunt for something that might be of direct help to you, specifically, but in the meantime, I am wondering if you have taken a look at our documentation and other resources concerning on-device authorization? If so, was any of that helpful, or what might we do to make it more so? Feel free to tell us more about what you are trying to do.
-James Merritt, Sr. Technical Writer
Developer Relations, Roku, Inc.