start method
Starts the web authentication session.
Returns a boolean value indicating whether the web authentication session started successfully.
Only call this method once for a given PlatformWebAuthenticationSession instance after initialization. Calling the start method on a canceled session results in a failure.
Officially Supported Platforms/Implementations:
Implementation
Future<bool> start() {
throw UnimplementedError(
'start is not implemented on the current platform');
}