docs: public void getToken(String authorizationCode, @NonNull final AuthCallback callback) {
          apiClient.token(authorizationCode, redirectUri)
                  .setCodeVerifier(codeVerifier)
                  .start(new BaseCallback<Credentials, AuthenticationException>() {
                      @Override
                      public void onSuccess(Credentials payload) {
                          callback.onSuccess(payload);
                      }
  
                      @Override
                      public void onFailure(AuthenticationException error) {
                          if ("Unauthorized".equals(error.getDescription())) {
                              Log.e(TAG, "Please go to 'https://manage.auth0.com/#/applications/" + apiClient.getClientId() + "/settings' and set 'Client Type' to 'Native' to enable PKCE.");
                          }
                          callback.onFailure(error);
                      }
                  });
      }