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frontend/src/pages/WaiterPOS.jsx

@@ -2,7 +2,7 @@ import React, { useState, useEffect } from 'react';
 import { useAuth } from '../context/AuthContext';
 import { useNavigate } from 'react-router-dom';
 import { db } from '../firebase/config';
-import { ref, onValue, push, set } from 'firebase/database';
+import { ref, onValue, push, set, update } from 'firebase/database';
 import { LogOut, Coffee, Send, Trash2, ShoppingBag, Truck, Receipt, CheckCircle, XCircle, CreditCard, Banknote, QrCode } from 'lucide-react';
 
 export default function WaiterPOS() {