connect with backend

lib/services/invoice_service.dart

@@ -0,0 +1,34 @@
+import 'package:dio/dio.dart';
+
+class InvoiceService {
+  final Dio dio;
+  InvoiceService(this.dio);
+
+  Future<Map<String, dynamic>> getAllInvoices() async {
+    try {
+      final res = await dio.get("/user/invoices");
+      return Map<String, dynamic>.from(res.data);
+    } catch (e) {
+      return {"success": false, "message": e.toString()};
+    }
+  }
+
+  Future<Map<String, dynamic>> getInstallments(int invoiceId) async {
+    try {
+      final res = await dio.get("/user/invoice/$invoiceId/installments");
+      return Map<String, dynamic>.from(res.data);
+    } catch (e) {
+      return {"success": false, "message": e.toString()};
+    }
+  }
+
+  /// 🔵 NEW FUNCTION — Fetch Full Invoice Details
+  Future<Map<String, dynamic>> getInvoiceDetails(int invoiceId) async {
+    try {
+      final res = await dio.get("/user/invoice/$invoiceId/details");
+      return Map<String, dynamic>.from(res.data);
+    } catch (e) {
+      return {"success": false, "message": e.toString()};
+    }
+  }
+}