CoinPickup.cs

using UnityEngine;
using System.Collections;

public class CoinPickup : MonoBehaviour {

	public int pointsToAdd;

	void OnTriggerEnter2D (Collider2D other)
	{
		if(other.GetComponent<PlayerController>()== null)
			return;

		ScoreManager.AddPoints(pointsToAdd);

		Destroy (gameObject);

	}

}