code: public static Optional<MultifactorAuthenticationProvider> getMultifactorAuthenticationProviderById(final String providerId,
                                                                                                         final ApplicationContext context) {
          return getAvailableMultifactorAuthenticationProviders(context).values()
              .stream()
              .filter(p -> p.matches(providerId))
              .findFirst();
      }
docs: Method returns an Optional that will contain a {@link MultifactorAuthenticationProvider} that has the
  same id as the passed providerId parameter.
  
  @param providerId - the id to match
  @param context    - ApplicationContext
  @return - Optional