Update

Assets/Scripts/UI/FirebaseService.cs

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+using System;
+using System.Collections;
+using System.Threading.Tasks;
+using UnityEngine;
+using UnityEngine.Networking;
+
+namespace Hallucinate.UI
+{
+    public static class FirebaseService
+    {
+        // Thay link database của bạn vào đây
+        private const string BASE_URL = "https://YOUR_FIREBASE_URL.firebaseio.com/users";
+
+        public static async Task<bool> IsUsernameTaken(string username)
+        {
+            string url = $"{BASE_URL}/{username}.json";
+            using (UnityWebRequest request = UnityWebRequest.Get(url))
+            {
+                var operation = request.SendWebRequest();
+                while (!operation.isDone) await Task.Yield();
+
+                if (request.result != UnityWebRequest.Result.Success) return false;
+                
+                // Nếu kết quả trả về không phải "null" nghĩa là user đã tồn tại
+                return request.downloadHandler.text != "null";
+            }
+        }
+
+        public static async Task<bool> RegisterUser(string username)
+        {
+            string url = $"{BASE_URL}/{username}.json";
+            string jsonData = "{\"created_at\": \"" + DateTime.Now.ToString() + "\"}";
+
+            using (UnityWebRequest request = UnityWebRequest.Put(url, jsonData))
+            {
+                var operation = request.SendWebRequest();
+                while (!operation.isDone) await Task.Yield();
+
+                return request.result == UnityWebRequest.Result.Success;
+            }
+        }
+    }
+}