ExecuteRetrofitRequest.java

UserService apiService = retrofit.create(UserService.class);
    
String username = "b00sti";
Call<User> call = apiService.getUser(username);
call.enqueue(new Callback<User>() {
    @Override
    public void onResponse(Call<User> call, Response<User> response) {
        int statusCode = response.code();
        User user = response.body();  
    }

    @Override
    public void onFailure(Call<User> call, Throwable t) {
        // Do something if error occurs
    }
});