Snippet showing how to initialize OneSignal Unity SDK

ExampleBehaviour.cs

using System;
using UnityEngine;
using UnityEngine.UI;
using OneSignalSDK;

public class ExampleBehaviour : MonoBehaviour
{
    public OSConfigData configData;
    public string externalId;

    private void Start()
    {
        OneSignal.Initialize(configData.appId);
    }
    
    private void _userStateChanged(object sender, UserStateChangedEventArgs e) {
        // OneSignal ID and External ID are available in event state
        // e.g., `e.state.Current.OneSignalId`
    }
    
    public void LoginUser() {
        OneSignal.Login(externalId);
    }
    
    public void SetExternalIdString(string newVal) => externalId = newVal;
    
    
}