Connect customer quotations and payment execution to Sendico (#50)

frontend/app/lib/main.dart

@@ -63,8 +63,11 @@ class _SxchngeAppState extends State<SxchngeApp> {
   late final _locale = widget.localeProvider ?? LocaleProvider();
 
   late final _analytics = widget.analyticsService ?? DummyAnalyticsService();
-  late final _factors =
+  late final _authFactors =
       widget.backend ?? widget.twoFactorService ?? DummyTwoFactorService();
+  late final _factors = _walletService is BackendWalletService
+      ? WalletFactorService(_walletService, _authFactors)
+      : _authFactors;
   late final _security = SecurityProvider(_factors, _analytics);
   late final _identity =
       widget.identityService ??
@@ -76,11 +79,16 @@ class _SxchngeAppState extends State<SxchngeApp> {
             ));
   late final _walletService =
       widget.walletService ??
-      DummyWalletService(
-        _identity,
-        initialLocale: _locale.locale.languageCode,
-        factors: _factors,
-      );
+      (widget.backend != null
+          ? BackendWalletService(
+              baseUri: widget.backend!.baseUri,
+              accessToken: () => widget.backend!.session?.accessToken,
+            )
+          : DummyWalletService(
+              _identity,
+              initialLocale: _locale.locale.languageCode,
+              factors: _authFactors,
+            ));
   late final _wallet = WalletProvider(
     _walletService,
     _analytics,
@@ -109,14 +117,21 @@ class _SxchngeAppState extends State<SxchngeApp> {
         : () => widget.backend!.session != null,
   )..routeInformationProvider.addListener(_routeChanged);
   String _previousPath = '/';
+  String? _walletCustomer;
 
   @override
   void initState() {
     super.initState();
     _previousPath = _router.routeInformationProvider.value.uri.path;
+    _walletCustomer = widget.backend?.session?.userId;
   }
 
   void _routeChanged() {
+    final customer = widget.backend?.session?.userId;
+    if (customer != _walletCustomer) {
+      _walletCustomer = customer;
+      _wallet.reset();
+    }
     final path = _router.routeInformationProvider.value.uri.path;
     if (path == '/' && _previousPath != '/' && _previousPath != '/two-factor') {
       _journeys.abandon(JourneyExit.navigation);
@@ -130,6 +145,9 @@ class _SxchngeAppState extends State<SxchngeApp> {
     _router.dispose();
     _journeys.dispose();
     _wallet.dispose();
+    if (_walletService is BackendWalletService) {
+      _walletService.close();
+    }
     _security.dispose();
     if (_identity is BackendIdentityService) {
       _identity.close();