If you have your own existing backend server, you can integrate it with Universal Friend List by implementing the INetworkFriendSystem interface or extending BaseCustomFriendSystem.

• You already have an existing game server with user accounts
• You need tight integration with your existing database
• You have specific business logic requirements
• You want to use your own authentication system
• You need custom moderation or anti-cheat features

Step 1: Create Your Implementation

Extend BaseCustomFriendSystem or implement INetworkFriendSystem directly:

using System;
using System.Collections.Generic;
using ElderWorldStudio.FriendList.Abstractions;
using ElderWorldStudio.FriendList.Models;

public class MyGameFriendSystem : BaseCustomFriendSystem
{
    public MyGameFriendSystem(FriendManagerSettings settings)
        : base(settings) { }

    public override void Initialize(string userId)
    {
        // Connect to your server and set up user session
        base.Initialize(userId);
    }

    public override void RefreshFriendList()
    {
        // Call your API to get friend list
        // Parse response and call OnFriendsListUpdated event
    }

    public override void SendFriendRequest(string userId, Action<bool, string> callback)
    {
        // Call your API to send friend request
    }

    // Implement other required methods...
}

Step 2: Register Your Implementation

Register your custom system with the factory:

// At game startup, before using FriendManager
GameTypeFactory.RegisterCustomFactory<MyGameFriendSystem>();

When implementing INetworkFriendSystem, you must provide:

Study these existing implementations for guidance:

• Scripts/Networking/CustomBackendFriendSystem.cs - Main custom implementation base
• Scripts/Networking/Server/ElderWorldStudioServerClient.cs - HTTP client to ElderWorldStudio server
• Scripts/Networking/Server/ElderWorldStudioWebSocketClient.cs - WebSocket client