Implements basic scoring example for Unity of GameJolt API and API Helper by Loic Teixiera @loicteixeira

GJBehavior.cs

using UnityEngine;
using System.Collections;

// 0. Download this file as GJBehavior.cs
// 1. Attach this script to a new GameObject and rename it to "GJAPI".
// 2. Edit game and api key
// 3. To post score from anywhere
// 		if (GameObject.Find("GJAPI").GetComponent<GJBehavior>().CanAddScore)
//  			GJAPI.Scores.Add(score.ToString() + " points", (uint)score, 14669, "");

public class GJBehavior : MonoBehaviour {

	// Use this for initialization
	void Awake () {
		DontDestroyOnLoad(gameObject);
		GJAPI.Init(14443, // Test Value, Replace with yours
		           "41927b93329fe63a5e1e7c3f67df62a9", // Test Value, Replace with yours
		           true,
		           1);
		GJAPI.Users.VerifyCallback += OnUserVerified;
		GJAPI.Scores.AddCallback += OnScoreAdded;
		GJAPIHelper.Users.GetFromWeb(OnGetFromWeb);
	}
	
	void OnGetFromWeb (string name, string token)
	{
		if (!(name != null && token != null))
			return;
		GJAPI.Users.Verify(name, token);
	}
	
	void OnUserVerified(bool success)
	{
		can_add_score = success;
	}
	
	bool can_add_score = false;
	public bool CanAddScore { get {return can_add_score; } }
	
	void OnScoreAdded(bool success)
	{
		if (success) {
			Debug.Log ( "Score Added!" );
		}
		else {
			Debug.Log ( "Score Added Failed!" );
		}
	}	
}