Let anyone sign into your app with their JarvisAF account. Standard OAuth 2.0 with OpenID Connect and PKCE.
Sign in to JarvisAF and go to /developer. Create an OAuth app with your redirect URI (e.g. https://myapp.com/oauth/callback). You'll get a client_id and one-time client_secret.
authorization_code and refresh_token grants are supported.S256) is strongly recommended and required for public clients.