How do I properly initialize UDP SDK?

Question

When uploading my game to Unity Distribution Portal (UDP), I kept on receiving this message about sandbox testing:

It seems your game was never tested in the UDP Sandbox environment, as no UDP Initialization call was found on the UDP back-end. Launch your APK in the UDP Sandbox environment to ensure it initializes properly. You must complete this step to release your game.

Now, I initially thought that Unity sandbox testing was enabled as soon as you installed the UDP plugins, but I have read that you need to make a script like this for the testing procedures to pass:

using UnityEngine;
using UnityEngine.UDP;

public class InitListener : IInitListener
{  
     public void Initialize()
     {
          StoreService.Initialize(IInitListener listener);
     }
     public void OnInitialized(UserInfo userInfo)
     {
          Debug.Log("Initialization succeeded"); 
     }
     public void OnInitializeFailed(string message)
     {
          Debug.Log("Initialization failed: " + message);
     }
}

However, I kept on encountering a syntax error that said

InitListener.cs(9,49): error CS1003: Syntax error, ',' expected

...Even though there's no need for a ",".

Typppi also suggested calling from another script to refer to this one, which I have made:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UDP;

public Script listener;
public class Initializer : MonoBehaviour
{
    void Start()
    {
        StoreService.Initialize(IInitListener listener);
    }
}

Yet it still returns the same syntax error. Even then, what am I supposed to do with this initialization script? Where do I assign it?

Thank you for reading.

Answer 1

The method the official unity documentation mentions is written in a confusingly non-linear way. In your initialization script, both the initialize() function and the OnInitialize() functions have to be in the same script. Thus the actual InitListener script would be:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UDP;
public class InitListener : MonoBehaviour, IInitListener
{
    public IInitListener listener;
    public void Start()
    {
        StoreService.Initialize(listener);
    }

    public void OnInitialized(UserInfo userInfo)
    {
        Debug.Log("Initialization succeeded");
        // You can call the QueryInventory method here
        // to check whether there are purchases that haven’t be consumed.       
    }

    public void OnInitializeFailed(string message)
    {
        Debug.Log("Initialization failed: " + message);
    }
}