Trigger.cs

using System;
using UnityEngine;
using UnityEngine.Events;

namespace HumanAPI
{
    [RequireComponent(typeof(Collider))]
    public class Trigger : MonoBehaviour
    {
        public LayerMask activatorLayers;
        public UnityEvent onEnter, onStay, onExit; //
        
        private void OnTriggerEnter(Collider other)
        {
            if ((activatorLayers & 1 << other.gameObject.layer) > 0)
                onEnter.Invoke();
        }
        
        private void OnTriggerStay(Collider other)
        {
            if ((activatorLayers & 1 << other.gameObject.layer) > 0)
                onStay.Invoke();
        }
        
        private void OnTriggerExit(Collider other)
        {
            if ((activatorLayers & 1 << other.gameObject.layer) > 0)
                onExit.Invoke();
        }
    }
}