# Upgrade 1.3 🠚 1.4

{% hint style="success" %}
Before upgrading, back up your project to avoid any data loss.
{% endhint %}

{% hint style="warning" %}
APIs marked as deprecated on 1.2 and earlier are removed on 1.4. Make sure your project is not using them before upgrading.
{% endhint %}

## AuthClient API changes

We've greatly simplified the `AuthClient` API which should make it much easier to use and much harder to get wrong.

Part of the changes is moving the responsibility of storing the guest login credentials to the consumer of the `AuthClient`.

All `Login` methods return a `LoginResult` object which contains credentials required for further sign-ins, including the `SessionToken` which was previously stored in the `AuthClient`. It is in caller's best interest to store those credentials so they can be reuse in the next session.

Example of a new sign up / sign in flow:

```csharp
async Task<bool> SignUp(AuthClient authClient, string username, string password)
{
    LoginResult loginResult = await authClient.LoginWithPassword(username, password, autoSignup: true);
    if(loginResult.Type != Result.Success)
    {
        // ... handle failure
        return false;
    }

    // Custom token saving function
    SaveSessionToken(loginResult.SessionToken);
    return true;
}

async Task<bool> SignIn(AuthClient authClient)
{
    // Custom token loading function
    var sessionToken = LoadSessionToken();
    if(sessionToken == null)
    {
        // ... handle failure
        return false;
    }

    LoginResult loginResult = await authClient.LoginWithToken(sessionToken);
    return loginResult.Type == Result.Success;
}
```

The new `AuthClient` API looks as follows:

```csharp
event Action<LoginResponse> OnLogin;
event Action OnLogout;
event Action<LoginError> OnError;

bool LoggedIn { get; }

Task<LoginResult> LoginAsGuest();
Task<LoginResult> LoginWithPassword(string username, string password, bool autoSignup);
Task<LoginResult> LoginWithToken(SessionToken sessionToken);

void Logout();
void Dispose();
```