# Unity

## Introduction

To interact with the PLAY API, you will need to be authenticated. This will allow you to store and retrieve additional user data in the PLAY ecosystem. 

### **Guest Login/Logout**

If the **Auto Guest Login** option in **RGNUnityInitilizer.cs** is checked, logging out from email will automatically sign you back in as guest. 

### Subscribe Authentication Changed event 

```csharp
using RGN;
using RGN.Modules.SignIn;
using UnityEngine;

public class AuthenticationChangedController : MonoBehaviour
{
    private void OnEnable()
    {
        RGNCore.I.AuthenticationChanged += OnAuthenticationChangedAsync;
    }
    private void OnDisable()
    {
        RGNCore.I.AuthenticationChanged -= OnAuthenticationChangedAsync;
    }

    private async void OnAuthenticationChangedAsync(AuthState authState)
    {
        switch (authState.LoginState)
        {
            case EnumLoginState.Success:
                Debug.Log("User is logged in");
                // You can start retrieving some data here
                break;
            case EnumLoginState.NotLoggedIn:
                Debug.Log("User is not logged in");
                break;
            case EnumLoginState.Error:
                Debug.LogError("On Auth error: " + authState.LoginState +
                    ", error: " + authState.LoginResult);
                break;
            default:
                Debug.LogError("Unhandled Login State: " + authState.LoginState);
                break;
        }
    }
}
```

### **Email Login/Logout**

```csharp
using RGN.Modules.SignIn;

public class EmailLoginLogout : MonoBehaviour
{
    public void EmailSignIn()
    {
        // This call will open a web form
        // Handle the result in RGNCore.I.AuthenticationChanged event callback
        EmailSignInModule.I.TryToSignIn();
    }
    public void EmailSignOut()
    {
        EmailSignInModule.I.SignOut();
    }
}
```