private void userSingIn(){

    String cardId = editcard.getText().toString().trim();


    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(APIUrl.DETAILS_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    APIService service = retrofit.create(APIService.class);

    final User user = new User();
    user.setCardId(cardId);

    Call<Result> call = service.loginUser(
            user.getCardId()

    );

    call.enqueue(new Callback<Result>() {
        @Override
        public void onResponse(Call<Result> call, Response<Result> response) {

            Toast.makeText(getApplicationContext(), response.body().getPoints(), Toast.LENGTH_LONG).show();
            userpass = response.body().getPassword();
            points = response.body().getPoints();


        }

        @Override
        public void onFailure(Call<Result> call, Throwable t) {
            Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_LONG).show();

        }
    });


}