feat: add Binance Pay webhook handler and implement payment order creation in billing service

packages/flutter-sdk/example/lib/main.dart

@@ -0,0 +1,78 @@
+import 'package:flutter/material.dart';
+import 'package:intaleq_maps/intaleq_maps.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Intaleq Maps Example',
+      theme: ThemeData(
+        useMaterial3: true,
+        colorSchemeSeed: Colors.blue,
+      ),
+      home: const MapScreen(),
+    );
+  }
+}
+
+class MapScreen extends StatefulWidget {
+  const MapScreen({super.key});
+
+  @override
+  State<MapScreen> createState() => _MapScreenState();
+}
+
+class _MapScreenState extends State<MapScreen> {
+  IntaleqMapController? _controller;
+
+  // Example marker
+  final Set<Marker> _markers = {
+    const Marker(
+      markerId: MarkerId('damascus'),
+      position: LatLng(33.5138, 36.2765),
+      infoWindow: InfoWindow(
+        title: 'Damascus',
+        snippet: 'The oldest continuously inhabited city.',
+      ),
+    ),
+  };
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Intaleq Maps Demo'),
+      ),
+      body: IntaleqMap(
+        apiKey: 'YOUR_API_KEY_HERE', // Replace with a valid key
+        initialCameraPosition: const CameraPosition(
+          target: LatLng(33.5138, 36.2765),
+          zoom: 12,
+        ),
+        markers: _markers,
+        onCameraMoveStarted: () {
+          debugPrint('Camera movement started');
+        },
+        onMapCreated: (controller) {
+          setState(() {
+            _controller = controller;
+          });
+        },
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {
+          _controller?.animateCamera(
+            CameraUpdate.newLatLngZoom(const LatLng(31.9454, 35.9284), 12),
+          );
+        },
+        child: const Icon(Icons.location_city),
+      ),
+    );
+  }
+}