c# - Unity3d,integrate correctly with a json api?

Question

I'm pretty new to c# and unity i'm trying to create a class able to talk with an external server via json API.

It was fine until I saw the code and I was repeating the same pieces over and over (basically each method of the API had its Ienumerator function with the JSON.Parse part.

So I started thinking that it would have been better to create a single function Get_Json and make it able to return the API request in form of object. I hit a wall and I literally have no idea how go ahead, I would really appreciate some help on how to make this correct:

using UnityEngine;
using System.Collections;
using SimpleJSON;


public class Site : MonoBehaviour {

    /*
        base url http://example.com/
        * GET a Room:    /ajax/API/?method=Get&hashtag=HASHTAG
        * Create a Room: /ajax/API/?method=Create&hashtag=HASHTAG&token=TOKEN (optional)
        * Delete a Room: /ajax/API/?method=Delete&hashtag=HASHTAG&token=TOKEN
        * List Rooms:    /ajax/API/?method=List_rooms
        * List Hashtags: /ajax/API/?method=List_hashtags

    */

    private string base_url = "http://example.com/ajax/API/?method=";
    private string q = "";

    IEnumerator Get_Json(string q){

        var url = base_url+q;
        WWW www = new WWW(url);
        yield return www;

        Debug.Log(www.text);

        if (www.error == null){

            var Resource = JSON.Parse(www.text);

            if(int.Parse(Resource["Code"]) == 200){
                Debug.Log("All right");
            }
            else{
                Debug.Log(Resource["Code"]);
            }

        }
        else{
            Debug.Log("Failed an http request:\n"+url+"\n"+www.error);
        }

        yield return null;

    }

     // Use this for initialization
     void Start () {
        StartCoroutine(Get_Json("List_rooms"));
     }

    // Update is called once per frame
    void Update () {

    }
}