diff --git a/mobile/lib/controllers/cart.dart b/mobile/lib/controllers/cart.dart
index ac5f6a0..1baa3c1 100644
--- a/mobile/lib/controllers/cart.dart
+++ b/mobile/lib/controllers/cart.dart
@@ -5,6 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:mobile/models/cart_item.dart';
 import 'package:mobile/models/product.dart';
 import 'package:mobile/results.dart';
+import 'package:mobile/server/server.dart';
 import 'package:path_provider/path_provider.dart';
 
 class ProductIdException implements Exception {}
@@ -23,9 +24,10 @@ abstract class CartController extends ChangeNotifier {
 }
 
 class CartControllerMemory extends CartController {
+  final Server server;
   final List<CartItem> cart = [];
 
-  CartControllerMemory();
+  CartControllerMemory({required this.server});
 
   @override
   List<CartItem> allCartItems() {
@@ -114,8 +116,14 @@ class CartControllerMemory extends CartController {
     notifyListeners();
   }
 
-  Result<Null, String> pay() {
-    return const Err("Not implemented");
+  Future<Result<Null, String>> purchase(String token) async {
+    final res = await server.purchaseCart(token, cart);
+    switch (res) {
+      case Success<Null>():
+        return const Ok(null);
+      case Error<Null>(message: final message):
+        return Err(message);
+    }
   }
 }
 
@@ -125,7 +133,7 @@ class CartControllerCache extends CartControllerMemory {
     return File("${directory.path}/cart.json").create();
   }
 
-  CartControllerCache() {
+  CartControllerCache({required super.server}) {
     load();
   }
 
@@ -137,7 +145,6 @@ class CartControllerCache extends CartControllerMemory {
 
   void load() async {
     final json = await (await _cacheFile).readAsString();
-    print("Loading cache: $json");
     if (json.isEmpty) {
       return;
     }
diff --git a/mobile/lib/controllers/session.dart b/mobile/lib/controllers/session.dart
index 042d79e..e8e81d3 100644
--- a/mobile/lib/controllers/session.dart
+++ b/mobile/lib/controllers/session.dart
@@ -6,6 +6,7 @@ import 'package:mobile/server/server.dart';
 class SessionController extends ChangeNotifier {
   final Server server;
   String? _sessionToken;
+  User? _user;
 
   SessionController({required this.server});
 
@@ -21,24 +22,53 @@ class SessionController extends ChangeNotifier {
     }
   }
 
-  Future<Result<User, Null>> user() async {
+  Future<void> _validateToken() async {
     final token = _sessionToken;
     if (token == null) {
+      return;
+    }
+    final res = await server.sessionUser(token);
+    switch (res) {
+      case Success<User>():
+        return;
+      case Error<User>():
+        _sessionToken = null;
+        return;
+    }
+  }
+
+  User? get user {
+    loadUser();
+    return _user;
+  }
+
+  Future<void> _notifyIfTokenChanged() async {
+    final prev = _sessionToken;
+    _validateToken();
+    if (prev != _sessionToken) {
       notifyListeners();
-      return const Err(null);
+    }
+  }
+
+  Future<void> loadUser() async {
+    final token = _sessionToken;
+    if (token == null) {
+      _user = null;
+      return;
     }
     final res = await server.sessionUser(token);
     switch (res) {
       case Success<User>(data: final user):
-        return Ok(user);
+        _user = user;
+        return;
       case Error<User>():
-        _sessionToken = null;
-        notifyListeners();
-        return const Err(null);
+        _user = null;
+        return;
     }
   }
 
   String? get sessionToken {
+    _notifyIfTokenChanged();
     return _sessionToken;
   }
 
@@ -50,8 +80,4 @@ class SessionController extends ChangeNotifier {
     }
     notifyListeners();
   }
-
-  Result<int, String> pay(int userId, int amount) {
-    return const Err("not implemented");
-  }
 }
diff --git a/mobile/lib/controllers/user.dart b/mobile/lib/controllers/user.dart
index caa0db9..2d3cb9a 100644
--- a/mobile/lib/controllers/user.dart
+++ b/mobile/lib/controllers/user.dart
@@ -1,11 +1,13 @@
 import 'package:flutter/material.dart';
+import 'package:mobile/controllers/session.dart';
 import 'package:mobile/results.dart';
 import 'package:mobile/server/server.dart';
 
 class UsersController extends ChangeNotifier {
   Server server;
+  SessionController sessionController;
 
-  UsersController({required this.server});
+  UsersController({required this.server, required this.sessionController});
 
   Future<Result<Null, String>> register(
       String name, String email, String password) async {
@@ -17,4 +19,19 @@ class UsersController extends ChangeNotifier {
         return Err(message);
     }
   }
+
+  Future<Result<Null, String>> addBalance() async {
+    final token = sessionController.sessionToken;
+    if (token == null) {
+      return const Err("No token");
+    }
+    final res = await server.addBalance(token);
+    notifyListeners();
+    switch (res) {
+      case Success<Null>():
+        return const Ok(null);
+      case Error<Null>(message: final message):
+        return Err(message);
+    }
+  }
 }
diff --git a/mobile/lib/main.dart b/mobile/lib/main.dart
index 39c91c9..271885f 100644
--- a/mobile/lib/main.dart
+++ b/mobile/lib/main.dart
@@ -26,17 +26,21 @@ class MyApp extends StatelessWidget {
     final server = BackendServer();
     return MultiProvider(
       providers: [
+        ChangeNotifierProvider(
+            create: (_) => SessionController(server: server)),
         ChangeNotifierProvider(create: (_) => RoutingController()),
         ChangeNotifierProvider(
             create: (_) => ProductController(server: server)),
-        ChangeNotifierProvider(create: (_) => CartControllerCache()),
+        ChangeNotifierProvider(
+            create: (_) => CartControllerCache(server: server)),
         ChangeNotifierProvider(create: (_) => ReceiptController()),
         ChangeNotifierProvider(create: (_) => PayingStateController()),
         ChangeNotifierProvider(create: (_) => AddToCartStateController()),
         ChangeNotifierProvider(create: (_) => LocationImageController()),
-        ChangeNotifierProvider(create: (_) => UsersController(server: server)),
         ChangeNotifierProvider(
-            create: (_) => SessionController(server: server)),
+            create: (context) => UsersController(
+                server: server,
+                sessionController: context.read<SessionController>())),
       ],
       child: MaterialApp(
           title: 'Fresh Plaza',
diff --git a/mobile/lib/pages/all_products_page.dart b/mobile/lib/pages/all_products_page.dart
index 18bd4b0..0f7077d 100644
--- a/mobile/lib/pages/all_products_page.dart
+++ b/mobile/lib/pages/all_products_page.dart
@@ -94,9 +94,23 @@ class ProductListItem extends StatelessWidget {
   }
 }
 
-class AllProductsPage extends StatelessWidget {
+class AllProductsPage extends StatefulWidget {
   const AllProductsPage({super.key});
 
+  @override
+  State<AllProductsPage> createState() => _AllProductsPageState();
+}
+
+class _AllProductsPageState extends State<AllProductsPage> {
+  final seawchContwowwew = TextEditingController();
+
+  @override
+  void initState() {
+    final contwowwew = context.read<ProductController>();
+    seawchContwowwew.text = contwowwew.query;
+    super.initState();
+  }
+
   @override
   Widget build(BuildContext context) {
     final productRepo = Provider.of<ProductController>(context);
@@ -114,6 +128,7 @@ class AllProductsPage extends StatelessWidget {
                         onChanged: (query) {
                           productRepo.searchProducts(query);
                         },
+                        controller: seawchContwowwew,
                         decoration: const InputDecoration(
                             label: Text("Search"),
                             contentPadding: EdgeInsets.only(top: 20))),
@@ -127,6 +142,7 @@ class AllProductsPage extends StatelessWidget {
                 return ListView.builder(
                   shrinkWrap: true,
                   itemBuilder: (_, idx) => ProductListItem(
+                    key: Key(products[idx].name),
                     productId: products[idx].id,
                     name: products[idx].name,
                     price: products[idx].priceDkkCent,
diff --git a/mobile/lib/pages/dashboard.dart b/mobile/lib/pages/dashboard.dart
index 9e94be3..457ed44 100644
--- a/mobile/lib/pages/dashboard.dart
+++ b/mobile/lib/pages/dashboard.dart
@@ -8,7 +8,7 @@ import 'package:mobile/controllers/cart.dart';
 import 'package:provider/provider.dart';
 
 class Dashboard extends StatelessWidget {
-  final List<StatelessWidget> pages = [];
+  final List<Widget> pages = [];
 
   Dashboard({super.key}) {
     pages.addAll([
diff --git a/mobile/lib/pages/finish_shopping_page.dart b/mobile/lib/pages/finish_shopping_page.dart
index 6169311..8cfb456 100644
--- a/mobile/lib/pages/finish_shopping_page.dart
+++ b/mobile/lib/pages/finish_shopping_page.dart
@@ -3,6 +3,7 @@ import 'package:mobile/controllers/routing.dart';
 import 'package:mobile/controllers/cart.dart';
 import 'package:mobile/controllers/paying_state.dart';
 import 'package:mobile/controllers/receipt.dart';
+import 'package:mobile/controllers/session.dart';
 import 'package:mobile/results.dart';
 import 'package:mobile/utils/price.dart';
 import 'package:mobile/widgets/primary_button.dart';
@@ -56,10 +57,11 @@ class FinishShoppingPage extends StatelessWidget {
                   child: Center(
                       child: PrimaryButton(
                           onPressed: () async {
+                            final session = context.read<SessionController>();
                             payingStateRepo.next();
                             await Future.delayed(const Duration(seconds: 1));
-                            // TODO: implement paying for user
-                            if (cartController.pay() is Err) {
+                            if (cartController.purchase(session.sessionToken!)
+                                is Err) {
                               if (context.mounted) {
                                 showDialog<String>(
                                   context: context,
diff --git a/mobile/lib/pages/home_page.dart b/mobile/lib/pages/home_page.dart
index bcc1c66..f934154 100644
--- a/mobile/lib/pages/home_page.dart
+++ b/mobile/lib/pages/home_page.dart
@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:mobile/controllers/session.dart';
+import 'package:mobile/controllers/user.dart';
 import 'package:mobile/pages/settings_page.dart';
 import 'package:mobile/utils/build_if_session_exists.dart';
 import 'package:mobile/utils/price.dart';
@@ -10,7 +11,8 @@ class HomePage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final sessionController = context.read<SessionController>();
+    final sessionController = context.watch<SessionController>();
+    context.watch<UsersController>();
     return Column(
       children: [
         Row(
@@ -34,7 +36,7 @@ class HomePage extends StatelessWidget {
                 color: Color(0xFFFFFFFF),
               ),
               padding: const EdgeInsets.all(10),
-              child: BuildIfSessionExists(
+              child: BuildIfSessionUserExists(
                   sessionController: sessionController,
                   placeholder: const CircularProgressIndicator(),
                   builder: (context, user) => Text(
@@ -45,7 +47,7 @@ class HomePage extends StatelessWidget {
           child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
             children: [
-              BuildIfSessionExists(
+              BuildIfSessionUserExists(
                   sessionController: sessionController,
                   placeholder: const CircularProgressIndicator(),
                   builder: (context, user) => Text(
diff --git a/mobile/lib/pages/log_in_page.dart b/mobile/lib/pages/log_in_page.dart
index 8867846..2edf715 100644
--- a/mobile/lib/pages/log_in_page.dart
+++ b/mobile/lib/pages/log_in_page.dart
@@ -74,6 +74,7 @@ class LogInFormState extends State<LogInForm> {
             child: const Text("Log ind")),
         TextButton(
           onPressed: () {
+            setState(() => loginError = false);
             Navigator.of(context).push(
                 MaterialPageRoute(builder: (context) => const RegisterPage()));
           },
diff --git a/mobile/lib/pages/register_page.dart b/mobile/lib/pages/register_page.dart
index 9764460..0afdaf1 100644
--- a/mobile/lib/pages/register_page.dart
+++ b/mobile/lib/pages/register_page.dart
@@ -88,6 +88,7 @@ class RegisterFormState extends State<RegisterForm> {
             child: const Text("Opret bruger")),
         TextButton(
           onPressed: () {
+            setState(() => registerError = false);
             Navigator.of(context).pop();
           },
           child: RichText(
diff --git a/mobile/lib/pages/settings_pages/saldo.dart b/mobile/lib/pages/settings_pages/saldo.dart
index 600192a..f818743 100644
--- a/mobile/lib/pages/settings_pages/saldo.dart
+++ b/mobile/lib/pages/settings_pages/saldo.dart
@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:mobile/controllers/session.dart';
+import 'package:mobile/controllers/user.dart';
+import 'package:mobile/results.dart';
 import 'package:mobile/utils/build_if_session_exists.dart';
 import 'package:mobile/utils/price.dart';
 import 'package:provider/provider.dart';
@@ -10,6 +12,7 @@ class SaldoSettingsPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final sessionController = context.watch<SessionController>();
+    final userController = context.watch<UsersController>();
     return Scaffold(
       backgroundColor: Colors.white,
       body: SafeArea(
@@ -25,17 +28,23 @@ class SaldoSettingsPage extends StatelessWidget {
                 ),
               ],
             ),
-            BuildIfSessionExists(
-              sessionController: sessionController,
-              placeholder: const CircularProgressIndicator(),
-              builder: (context, user) => Text(
-                  "Nuværende saldo: ${formatDkkCents(user.balanceDkkCents)}",
-                  style: Theme.of(context).textTheme.bodyLarge),
-            ),
+            BuildIfSessionUserExists(
+                sessionController: sessionController,
+                placeholder: const CircularProgressIndicator(),
+                builder: (context, user) {
+                  return Text(
+                      "Nuværende saldo: ${formatDkkCents(user.balanceDkkCents)}",
+                      style: Theme.of(context).textTheme.bodyLarge);
+                }),
             ElevatedButton.icon(
-              onPressed: () {
-                // TODO: implement add balance
-                throw Exception("not implemented: Adding funds");
+              onPressed: () async {
+                final res = await userController.addBalance();
+                switch (res) {
+                  case Ok<Null, String>():
+                    print("yay");
+                  case Err<Null, String>(value: final message):
+                    print("Womp womp fejled er: $message");
+                }
               },
               icon: const Icon(Icons.add),
               label: const Text("Tilføj 100,00 kr"),
diff --git a/mobile/lib/server/backend_server.dart b/mobile/lib/server/backend_server.dart
index 8386173..4082d90 100644
--- a/mobile/lib/server/backend_server.dart
+++ b/mobile/lib/server/backend_server.dart
@@ -1,6 +1,7 @@
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
+import 'package:mobile/models/cart_item.dart';
 import 'package:mobile/models/product.dart';
 import 'package:mobile/models/user.dart';
 import 'package:mobile/server/server.dart';
@@ -10,7 +11,7 @@ class BackendServer implements Server {
   // final _apiUrl = "http://127.0.0.1:8080/api";
 
   Future<http.Response> _post(
-      {required String endpoint, required Map<String, dynamic> body}) async {
+      {required String endpoint, Map<String, dynamic>? body}) async {
     final encoded = json.encode(body);
     return await http.post(
       Uri.parse("$_apiUrl/$endpoint"),
@@ -75,9 +76,6 @@ class BackendServer implements Server {
   Future<Response<Null>> logout(String token) async {
     final res = await _post(
       endpoint: "sessions/logout",
-      body: {
-        "token": token,
-      },
     ).then((res) => json.decode(res.body));
 
     if (res["ok"]) {
@@ -102,11 +100,34 @@ class BackendServer implements Server {
   }
 
   @override
-  Future<Response<Null>> payForCart(String token) async {
-    final res = await _post(
-      endpoint: "cart/pay",
-      body: {
-        "token": token,
+  Future<Response<Null>> purchaseCart(
+      String token, List<CartItem> cartItems) async {
+    final res = await http.post(Uri.parse("$_apiUrl/carts/purchase"), headers: {
+      "Content-Type": "application/json",
+      "Session-Token": token
+    }, body: {
+      "cart_items": cartItems
+          .map((cartItem) =>
+              {"product_id": cartItem.product.id, "amount": cartItem.amount})
+          .toList()
+    }).then((res) => json.decode(res.body));
+
+    if (res["ok"]) {
+      return Success(data: null);
+    } else {
+      return Error(message: res["msg"]);
+    }
+  }
+
+  @override
+  Future<Response<Null>> addBalance(String token) async {
+    print("$_apiUrl/api/users/balance/add");
+    final res = await http.post(
+      Uri.parse("$_apiUrl/users/balance/add"),
+      headers: {
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+        "Session-Token": token
       },
     ).then((res) => json.decode(res.body));
 
diff --git a/mobile/lib/server/mock_server.dart b/mobile/lib/server/mock_server.dart
index dd4f183..0500231 100644
--- a/mobile/lib/server/mock_server.dart
+++ b/mobile/lib/server/mock_server.dart
@@ -1,3 +1,4 @@
+import 'package:mobile/models/cart_item.dart';
 import 'package:mobile/models/coordinate.dart';
 import 'package:mobile/models/product.dart';
 import 'package:mobile/models/user.dart';
@@ -122,7 +123,13 @@ class MockServer implements Server {
   }
 
   @override
-  Future<Response<Null>> payForCart(String token) async {
+  Future<Response<Null>> purchaseCart(
+      String token, List<CartItem> cartItems) async {
+    return Success(data: null);
+  }
+
+  @override
+  Future<Response<Null>> addBalance(String token) async {
     return Success(data: null);
   }
 }
diff --git a/mobile/lib/server/server.dart b/mobile/lib/server/server.dart
index f888d65..c224055 100644
--- a/mobile/lib/server/server.dart
+++ b/mobile/lib/server/server.dart
@@ -1,3 +1,4 @@
+import 'package:mobile/models/cart_item.dart';
 import 'package:mobile/models/product.dart';
 import 'package:mobile/models/user.dart';
 
@@ -18,7 +19,9 @@ abstract class Server {
 
   Future<Response<User>> sessionUser(String token);
 
-  Future<Response<Null>> payForCart(String token);
+  Future<Response<Null>> purchaseCart(String token, List<CartItem> cartItems);
+
+  Future<Response<Null>> addBalance(String token);
 }
 
 sealed class Response<Data> {}
diff --git a/mobile/lib/utils/build_if_session_exists.dart b/mobile/lib/utils/build_if_session_exists.dart
index 7705936..20f2503 100644
--- a/mobile/lib/utils/build_if_session_exists.dart
+++ b/mobile/lib/utils/build_if_session_exists.dart
@@ -1,14 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:mobile/controllers/session.dart';
 import 'package:mobile/models/user.dart';
-import 'package:mobile/results.dart';
 
-class BuildIfSessionExists extends StatelessWidget {
+class BuildIfSessionUserExists extends StatelessWidget {
   final SessionController sessionController;
   final Widget placeholder;
   final Widget Function(BuildContext, User) builder;
 
-  const BuildIfSessionExists(
+  const BuildIfSessionUserExists(
       {super.key,
       required this.sessionController,
       required this.placeholder,
@@ -17,17 +16,13 @@ class BuildIfSessionExists extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return FutureBuilder(
-        future: sessionController.user(),
+        future: sessionController.loadUser(),
         builder: (context, snapshot) {
-          final data = snapshot.data;
-          if (data == null) {
+          final user = sessionController.user;
+          if (user == null) {
             return placeholder;
           }
-          if (data is Ok<User, Null>) {
-            final user = data.value;
-            return builder(context, user);
-          }
-          return Container();
+          return builder(context, user);
         });
   }
 }