public void doSignUp(OnAddUpdateListener<SignUpValidationError> listListener, SignUpRequest request) {
    mListener = listListener;
    LeafApiClient apiClient = LeafApplication.getInstance().getApiClient();
    LeafService service = apiClient.getService(LeafService.class);
    final Call<SignUpResponse> model = service.signup(request);
    ResponseWrapper<SignUpResponse> wrapper = new ResponseWrapper<>(model);