# Authentication Service (Player Accounts)

By default, the **CloudService** will automatically authenticate as a Guest User, unless you disable *Auto Login As Guest* option in the CoherenceBridge inspector.

If you disable the automatic login, you can handle Player authentication manually through the **CloudService.GameServices.AuthService** API.

In this example, you can see how you can manually login as a Guest:

```csharp
using Coherence.Cloud;
using Coherence.Toolkit;
using System.Collections;
using UnityEngine;
using Result = Coherence.Runtime.Result;

public class LoginAsGuestExample : MonoBehaviour
{
    public CoherenceBridge bridge;

    private CloudService cloudService;

    void Start()
    {
        cloudService = bridge.CloudService;

        StartCoroutine(CheckRefreshLogin());
    }

    private IEnumerator CheckRefreshLogin()
    {
        IAuthClient authService = cloudService.GameServices.AuthService;

        while (!cloudService.IsConnectedToCloud && authService.SessionTokenRefreshResult == null)
        {
            yield return null;
        }

        // If refresh failed, we have to login as a guest again
        if (authService.SessionTokenRefreshResult == Result.InvalidCredentials)
        {
            var task = authService.LoginAsGuest();

            while (!task.IsCompleted)
            {
                yield return null;
            }
        }

        // At this point, we are ready to fully utilize the Cloud Service
    }
}
```

You can also choose to allow your users to create their own Player accounts, you can use the Authentication Service API in a similar fashion to allow for manual authentication:

```csharp
using Coherence.Cloud;
using Coherence.Toolkit;
using System.Collections;
using UnityEngine;
using Result = Coherence.Runtime.Result;

public class LoginAsUserExample : MonoBehaviour
{
    public CoherenceBridge bridge;

    public string username;
    public string password;

    private CloudService cloudService;

    void Start()
    {
        cloudService = bridge.CloudService;

        StartCoroutine(LoginAsAUser());
    }

    private IEnumerator LoginAsAUser()
    {
        IAuthClient authService = cloudService.GameServices.AuthService;

        while (!cloudService.IsConnectedToCloud && authService.SessionTokenRefreshResult == null)
        {
            yield return null;
        }

        // If refresh failed, we have to login as a user with the given credentials again
        if (authService.SessionTokenRefreshResult == Result.InvalidCredentials)
        {
            var task = authService.LoginWithPassword(username, password, true);

            while (!task.IsCompleted)
            {
                yield return null;
            }
        }

        // At this point, we are ready to fully utilize the Cloud Service
    }
}
```