API Reference > imodeljs-frontend > NativeApp > NativeAppAuthorization NativeAppAuthorization Class Object to be set as IModelApp.authorizationClient for the frontend of NativeApps. Since NativeApps use the backend for all authorization, this class sends signIn/signOut requests to the backend and then listens for the onUserStateChanged event to cache the accessToken. The token is cached here on the frontend because it is used for every RPC operation, even when we're running as a NativeApp. We must therefore check for expiration and request refreshes as/when necessary. Methods Name Description constructor(config?: NativeAppAuthorizationConfiguration): NativeAppAuthorization ctor for NativeAppAuthorization getAccessToken(): Promise<AccessToken> Returns a promise that resolves to the AccessToken if signed in. initialize(props: SessionProps): Promise<void> Used to initialize the the backend authorization. signIn(): Promise<void> Called to start the sign-in process. signOut(): Promise<void> Called to start the sign-out process. Properties Name Type Description _expireSafety Protected number hasSignedIn Accessor ReadOnly boolean isAuthorized Accessor ReadOnly boolean onUserStateChanged Readonly BeEvent<(token?: AccessToken) => void> Defined in core/frontend/src/NativeApp.ts Line 60 Last Updated: 29 November, 2022