diff --git a/Model/Bill.php b/Model/Bill.php
new file mode 100644
index 0000000..caff8fa
--- /dev/null
+++ b/Model/Bill.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Hpz937\BillReminder\Model;
+
+class Bill {
+    public int $id;
+    public string $dueDate; // Format: 'YYYY-MM-DD'
+    public float $amount;
+    public string $description;
+    public bool $isPaid;
+
+    public function __construct(int $id, string $dueDate, float $amount, string $description, bool $isPaid) {
+        $this->id = $id;
+        $this->dueDate = $dueDate;
+        $this->amount = $amount;
+        $this->description = $description;
+        $this->isPaid = $isPaid;
+    }
+
+    // Additional methods as needed, such as getters and setters
+}
diff --git a/Model/User.php b/Model/User.php
new file mode 100644
index 0000000..4e8e3ca
--- /dev/null
+++ b/Model/User.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Hpz937\BillReminder\Model;
+
+class User {
+    public int $id;
+    public string $username;
+    private string $passwordHash;
+
+    public function __construct(int $id, string $username, string $passwordHash) {
+        $this->id = $id;
+        $this->username = $username;
+        $this->passwordHash = $passwordHash;
+    }
+
+    // Add methods for password verification, etc.
+    public function verifyPassword(string $password): bool {
+        return password_verify($password, $this->passwordHash);
+    }
+}
diff --git a/Service/BillManager.php b/Service/BillManager.php
new file mode 100644
index 0000000..bd6aa4e
--- /dev/null
+++ b/Service/BillManager.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace Hpz937\BillReminder\Service;
+
+use Hpz937\BillReminder\Database\DatabaseInterface;
+use Hpz937\BillReminder\Model\Bill;
+
+class BillManager {
+    private DatabaseInterface $db;
+
+    public function __construct(DatabaseInterface $db) {
+        $this->db = $db;
+    }
+
+    public function createBill(Bill $bill): bool {
+        $sql = "INSERT INTO bills (dueDate, amount, description, isPaid) VALUES (:dueDate, :amount, :description, :isPaid)";
+        $this->db->prepare($sql);
+        $this->db->execute([
+            ':dueDate' => $bill->dueDate,
+            ':amount' => $bill->amount,
+            ':description' => $bill->description,
+            ':isPaid' => $bill->isPaid ? 1 : 0,
+        ]);
+        return $this->db->lastInsertId() > 0;
+    }    
+
+    public function getBill(int $id): ?Bill {
+        $sql = "SELECT * FROM bills WHERE id = :id";
+        $this->db->prepare($sql);
+        $this->db->execute([':id' => $id]);
+        $result = $this->db->fetch();
+        if ($result) {
+            return new Bill($result['id'], $result['dueDate'], $result['amount'], $result['description'], $result['isPaid'] == 1);
+        }
+        return null;
+    }
+    
+
+    public function updateBill(Bill $bill): bool {
+        $sql = "UPDATE bills SET dueDate = :dueDate, amount = :amount, description = :description, isPaid = :isPaid WHERE id = :id";
+        $this->db->prepare($sql);
+        return $this->db->execute([
+            ':id' => $bill->id,
+            ':dueDate' => $bill->dueDate,
+            ':amount' => $bill->amount,
+            ':description' => $bill->description,
+            ':isPaid' => $bill->isPaid ? 1 : 0,
+        ]);
+    }
+    
+
+    public function deleteBill(int $id): bool {
+        $sql = "DELETE FROM bills WHERE id = :id";
+        $this->db->prepare($sql);
+        return $this->db->execute([':id' => $id]);
+    }
+    
+
+    public function listBills(): array {
+        $sql = "SELECT * FROM bills";
+        $this->db->prepare($sql);
+        $this->db->execute();
+        $bills = [];
+        while ($row = $this->db->fetch()) {
+            $bills[] = new Bill($row['id'], $row['dueDate'], $row['amount'], $row['description'], $row['isPaid'] == 1);
+        }
+        return $bills;
+    }
+}
diff --git a/Service/UserManager.php b/Service/UserManager.php
new file mode 100644
index 0000000..66606cd
--- /dev/null
+++ b/Service/UserManager.php
@@ -0,0 +1,42 @@
+<?php
+namespace Hpz937\BillReminder\Service;
+
+use Hpz937\BillReminder\Database\DatabaseInterface;
+use Hpz937\BillReminder\Model\User;
+
+class UserManager {
+    private DatabaseInterface $db;
+
+    public function __construct(DatabaseInterface $db) {
+        $this->db = $db;
+    }
+
+    public function register(string $username, string $password): bool {
+        $passwordHash = password_hash($password, PASSWORD_DEFAULT);
+
+        $sql = "INSERT INTO users (username, passwordHash) VALUES (:username, :passwordHash)";
+        $this->db->prepare($sql);
+        return $this->db->execute([
+            ':username' => $username,
+            ':passwordHash' => $passwordHash,
+        ]);
+    }
+
+    public function login(string $username, string $password): ?User {
+        $sql = "SELECT * FROM users WHERE username = :username";
+        $this->db->prepare($sql);
+        $this->db->execute([':username' => $username]);
+        $result = $this->db->fetch();
+
+        if ($result && (new User($result['id'], $result['username'], $result['passwordHash']))->verifyPassword($password)) {
+            // Start or regenerate the session
+            session_regenerate_id();
+            $_SESSION['user_id'] = $result['id'];
+            return new User($result['id'], $result['username'], $result['passwordHash']);
+        }
+
+        return null;
+    }
+
+    // Additional methods as needed, e.g., for password change, user details update, etc.
+}
diff --git a/View/PageRenderer.php b/View/PageRenderer.php
new file mode 100644
index 0000000..a83ae65
--- /dev/null
+++ b/View/PageRenderer.php
@@ -0,0 +1,32 @@
+<?php
+namespace Hpz937\BillReminder\View;
+
+class PageRenderer {
+    public static function renderHeader($title = 'Bill Reminder') {
+        echo <<<HTML
+<!doctype html>
+<html lang="en">
+  <head>
+    <!-- Required meta tags -->
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <title>$title</title>
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.0.0/dist/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
+    <!-- Additional stylesheet links or other <head> elements -->
+</head>
+<body>
+<div class="container">
+HTML;
+    }
+
+    public static function renderFooter() {
+        echo <<<HTML
+</div> <!-- Closing container div -->
+<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
+<script src="https://cdn.jsdelivr.net/npm/popper.js@1.12.9/dist/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
+<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.0.0/dist/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
+</body>
+</html>
+HTML;
+    }
+}
diff --git a/composer.json b/composer.json
index b22cd92..700713b 100644
--- a/composer.json
+++ b/composer.json
@@ -13,5 +13,12 @@
             "email": "hpz937+code@gmail.com"
         }
     ],
-    "require": {}
+    "repositories": [{
+        "type": "composer",
+        "url": "https://git.hpz.pw/api/packages/hpz937/composer"
+    }
+    ],
+    "require": {
+        "hpz937/restclient": "1.0.0"
+    }
 }
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..6609e75
--- /dev/null
+++ b/index.php
@@ -0,0 +1,27 @@
+<?php
+
+// index.php
+session_start();
+
+require 'vendor/autoload.php'; // Assuming you're using Composer
+
+// Define a simple router
+$request = $_SERVER['REQUEST_URI'];
+
+switch ($request) {
+    case '/' :
+    case '' :
+        require __DIR__ . '/views/home.php';
+        break;
+    case '/login' :
+        require __DIR__ . '/views/login.php';
+        break;
+    case '/register' :
+        require __DIR__ . '/views/register.php';
+        break;
+    // Add more routes as needed
+    default:
+        http_response_code(404);
+        require __DIR__ . '/views/404.php';
+        break;
+}
diff --git a/setup.php b/setup.php
new file mode 100644
index 0000000..6fce6f6
--- /dev/null
+++ b/setup.php
@@ -0,0 +1,14 @@
+<?php
+use Hpz937\BillReminder\Database\DatabaseSetup;
+use Hpz937\BillReminder\Database\SQLite3Database;
+
+// Assuming you have a SQLite database file path
+$databaseFile = 'path/to/your/database/file.sqlite';
+
+$db = new SQLite3Database($databaseFile);
+$db->connect();
+
+$databaseSetup = new DatabaseSetup($db);
+$databaseSetup->setup();
+
+// Continue with the rest of your application setup
diff --git a/src/Database/DatabaseInterface.php b/src/Database/DatabaseInterface.php
new file mode 100644
index 0000000..9a715c9
--- /dev/null
+++ b/src/Database/DatabaseInterface.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Hpz937\BillReminder\Database;
+
+interface DatabaseInterface {
+    public function connect();
+    public function query(string $query);
+    public function prepare(string $sql);
+    public function execute(array $parameters = []);
+    public function fetch();
+    public function fetchAll();
+    public function close();
+}
+
diff --git a/src/Database/DatabaseSetup.php b/src/Database/DatabaseSetup.php
new file mode 100644
index 0000000..36df489
--- /dev/null
+++ b/src/Database/DatabaseSetup.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Hpz937\BillReminder\Database;
+
+class DatabaseSetup {
+    private DatabaseInterface $db;
+
+    public function __construct(DatabaseInterface $db) {
+        $this->db = $db;
+    }
+
+    public function setup(): void {
+        $this->createBillsTable();
+        $this->createUsersTable();
+    }
+
+    private function createBillsTable(): void {
+        $sql = <<<SQL
+CREATE TABLE IF NOT EXISTS bills (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    dueDate TEXT NOT NULL,
+    amount REAL NOT NULL,
+    description TEXT,
+    isPaid INTEGER NOT NULL
+);
+SQL;
+
+        $this->db->query($sql);
+    }
+
+    private function createUsersTable(): void {
+        $sql = <<<SQL
+CREATE TABLE users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    username TEXT UNIQUE NOT NULL,
+    passwordHash TEXT NOT NULL
+);
+SQL;
+
+        $this->db->query($sql);
+    }
+
+    // Additional methods to setup other tables as needed
+}
diff --git a/src/Database/SQLite3Database.php b/src/Database/SQLite3Database.php
new file mode 100644
index 0000000..98866d5
--- /dev/null
+++ b/src/Database/SQLite3Database.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Hpz937\BillReminder\Database;
+
+use SQLite3;
+use Exception;
+
+class SQLite3Database implements DatabaseInterface {
+    /**
+     * @var SQLite3
+     */
+    private $connection;
+
+    /**
+     * @var string The path to the SQLite database file.
+     */
+    private $databaseFile;
+
+    /**
+     * @var \SQLite3Stmt
+     */
+    private $statement;
+
+    public function __construct(string $databaseFile) {
+        $this->databaseFile = $databaseFile;
+    }
+
+    public function connect() {
+        try {
+            $this->connection = new SQLite3($this->databaseFile);
+        } catch (Exception $e) {
+            throw new Exception("Unable to connect to SQLite database: " . $e->getMessage());
+        }
+    }
+
+    public function query(string $query) {
+        if (!$this->connection) {
+            throw new Exception("No database connection");
+        }
+        return $this->connection->query($query);
+    }
+
+    public function prepare(string $sql) {
+        if (!$this->connection) {
+            throw new Exception("No database connection");
+        }
+        $this->statement = $this->connection->prepare($sql);
+        if (!$this->statement) {
+            throw new Exception("Failed to prepare SQL statement");
+        }
+    }
+
+    public function execute(array $parameters = []) {
+        if (!$this->statement) {
+            throw new Exception("No prepared statement");
+        }
+        foreach ($parameters as $param => $value) {
+            $this->statement->bindValue($param, $value);
+        }
+        return $this->statement->execute();
+    }
+
+    public function fetch() {
+        if (!$this->statement) {
+            throw new Exception("No prepared statement");
+        }
+        return $this->statement->fetchArray(SQLITE3_ASSOC);
+    }
+
+    public function fetchAll() {
+        $data = [];
+        while ($row = $this->fetch()) {
+            $data[] = $row;
+        }
+        return $data;
+    }
+
+    public function close() {
+        if ($this->connection) {
+            $this->connection->close();
+        }
+    }
+}
diff --git a/src/Notification/NftyNotification.php b/src/Notification/NftyNotification.php
new file mode 100644
index 0000000..50e8c98
--- /dev/null
+++ b/src/Notification/NftyNotification.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Hpz937\BillReminder\Notification;
+
+use Hpz937\Restclient\RestClient;
+use Exception;
+
+class NftyNotification implements NotificationInterface {
+    private $restClient;
+
+    public function __construct(RestClient $restClient) {
+        $this->restClient = $restClient;
+    }
+
+    public function send(string $to, string $message, array $options = []): bool {
+        try {
+            // ntfy.sh uses simple text/plain content type for the message body
+            $headers = ["Content-Type: text/plain"];
+            if (isset($options['title'])) {
+                $headers[] = "Title: {$options['title']}";
+            }
+            if (isset($options['priority'])) {
+                $headers[] = "Priority: {$options['priority']}";
+            }
+            if (isset($options['tags'])) {
+                $headers[] = "Tags: {$options['tags']}";
+            }
+
+            $this->restClient->setHeaders($headers);
+
+            // Use the RestClient's custom request method to mimic the file_get_contents approach
+            $this->restClient->post("https://ntfy.sh/{$this->to}", $message);
+
+            // Since ntfy.sh returns a simple response, we might not need to decode JSON
+            $response = $this->restClient->getResponse();
+
+            // Check the response or HTTP status code as needed to determine success
+            return true; // Assuming the request was successful, adjust based on actual response handling
+        } catch (Exception $e) {
+            // Error handling logic
+            return false;
+        }
+    }
+}
diff --git a/src/Notification/NotificationInterface.php b/src/Notification/NotificationInterface.php
new file mode 100644
index 0000000..51f5b48
--- /dev/null
+++ b/src/Notification/NotificationInterface.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Hpz937\BillReminder\Notification;
+
+interface NotificationInterface {
+    /**
+     * Sends a notification with optional parameters such as title and priority.
+     *
+     * @param string $to The recipient of the notification.
+     * @param string $message The message content of the notification.
+     * @param array $options Optional parameters for the notification, such as title, priority, and tags.
+     * @return bool Returns true on success, false on failure.
+     */
+    public function send(string $to, string $message, array $options = []): bool;
+}
diff --git a/views/404.php b/views/404.php
new file mode 100644
index 0000000..e69de29
diff --git a/views/dashboard.php b/views/dashboard.php
new file mode 100644
index 0000000..717aaa0
--- /dev/null
+++ b/views/dashboard.php
@@ -0,0 +1,50 @@
+<?php
+
+use Hpz937\BillReminder\View\PageRenderer;
+
+session_start();
+
+// Redirect to login if not logged in
+if (!isset($_SESSION['user_id'])) {
+    header('Location: /login');
+    exit;
+}
+
+PageRenderer::renderHeader('My Bills Dashboard');
+
+// Fetch user's bills from the database
+// $bills = fetchBillsForUser($_SESSION['user_id']);
+
+?>
+
+<h2>My Bills</h2>
+<a href="/add-bill" class="btn btn-success">Add New Bill</a>
+<div class="mt-3">
+    <table class="table">
+        <thead>
+            <tr>
+                <th>Due Date</th>
+                <th>Amount</th>
+                <th>Description</th>
+                <th>Status</th>
+                <th>Actions</th>
+            </tr>
+        </thead>
+        <tbody>
+            <?php foreach ($bills as $bill): ?>
+            <tr>
+                <td><?php echo htmlspecialchars($bill->dueDate); ?></td>
+                <td><?php echo htmlspecialchars($bill->amount); ?></td>
+                <td><?php echo htmlspecialchars($bill->description); ?></td>
+                <td><?php echo $bill->isPaid ? 'Paid' : 'Pending'; ?></td>
+                <td>
+                    <a href="/edit-bill/<?php echo $bill->id; ?>" class="btn btn-primary btn-sm">Edit</a>
+                    <a href="/delete-bill/<?php echo $bill->id; ?>" class="btn btn-danger btn-sm" onclick="return confirm('Are you sure?');">Delete</a>
+                </td>
+            </tr>
+            <?php endforeach; ?>
+        </tbody>
+    </table>
+</div>
+
+<?php PageRenderer::renderFooter(); ?>
diff --git a/views/home.php b/views/home.php
new file mode 100644
index 0000000..72d7ded
--- /dev/null
+++ b/views/home.php
@@ -0,0 +1,30 @@
+<?php
+
+use Hpz937\BillReminder\View\PageRenderer;
+
+session_start();
+
+PageRenderer::renderHeader('Bill Reminder Home');
+
+// views/home.php
+
+session_start(); // Ensure session is started to access session variables
+
+// Check if user is logged in
+$loggedIn = isset($_SESSION['user_id']);
+
+?>
+
+<h1>Welcome to Bill Reminder</h1>
+<p>Manage your bills efficiently and never miss a payment.</p>
+
+<?php if ($loggedIn): ?>
+    <p>Hello, <?php echo htmlspecialchars($_SESSION['username']); ?>!</p>
+    <a href="/dashboard" class="btn btn-primary">Go to Dashboard</a>
+    <a href="/logout" class="btn btn-secondary">Logout</a>
+<?php else: ?>
+    <a href="/login" class="btn btn-primary">Login</a>
+    <a href="/register" class="btn btn-secondary">Register</a>
+<?php endif; ?>
+
+<?php PageRenderer::renderFooter(); ?>
\ No newline at end of file
diff --git a/views/login.php b/views/login.php
new file mode 100644
index 0000000..e0c232e
--- /dev/null
+++ b/views/login.php
@@ -0,0 +1,35 @@
+<?php
+// views/login.php
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    // Handle login logic here
+    // Use UserManager to verify credentials
+    // Redirect to home page or dashboard on success
+}
+
+?>
+
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Login</title>
+    <link rel="stylesheet" href="path/to/bootstrap/css/bootstrap.min.css">
+</head>
+<body>
+
+<div class="container">
+    <h2>Login</h2>
+    <form method="POST" action="/login">
+        <div class="form-group">
+            <label for="username">Username:</label>
+            <input type="text" class="form-control" id="username" name="username" required>
+        </div>
+        <div class="form-group">
+            <label for="password">Password:</label>
+            <input type="password" class="form-control" id="password" name="password" required>
+        </div>
+        <button type="submit" class="btn btn-primary">Login</button>
+    </form>
+</div>
+
+</body>
+</html>
diff --git a/views/register.php b/views/register.php
new file mode 100644
index 0000000..53951e5
--- /dev/null
+++ b/views/register.php
@@ -0,0 +1,35 @@
+<?php
+// views/register.php
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    // Handle registration logic here
+    // Use UserManager to create a new user
+    // Redirect to login page on success
+}
+
+?>
+
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Register</title>
+    <link rel="stylesheet" href="path/to/bootstrap/css/bootstrap.min.css">
+</head>
+<body>
+
+<div class="container">
+    <h2>Register</h2>
+    <form method="POST" action="/register">
+        <div class="form-group">
+            <label for="username">Username:</label>
+            <input type="text" class="form-control" id="username" name="username" required>
+        </div>
+        <div class="form-group">
+            <label for="password">Password:</label>
+            <input type="password" class="form-control" id="password" name="password" required>
+        </div>
+        <button type="submit" class="btn btn-success">Register</button>
+    </form>
+</div>
+
+</body>
+</html>