Android all done.

lib/screens/purchase_success.dart

@@ -39,6 +39,7 @@ class PurchaseSuccessScreenState<T> extends BaseState<PurchaseSuccessScreen> {
   int bonusPlus = 0;
   int bonusMinus = 0;
   int currency;
+  String token;
   bool showBonus;
 
   bool isAutomaticallyImplyLeading() => false;
@@ -51,15 +52,18 @@ class PurchaseSuccessScreenState<T> extends BaseState<PurchaseSuccessScreen> {
     return null;
   }
 
-  @override Widget build(BuildContext context) {
-
-    if (currency == null) {
-      helper.getCurrency().then((currency) {
-        setState(() {
-          this.currency = currency;
-        });
+  @override
+  void initState() {
+    helper.getCurrency().then((currency) {
+      helper.getToken().then((token) {
+        this.currency = currency;
+        this.token = token;
       });
-    }
+    });
+    super.initState();
+  }
+
+  @override Widget build(BuildContext context) {
 
     if (this.details['sum_bonus'] is String) {
       String regexString = r'(\d+) начислено, (\d+).*';
@@ -122,9 +126,8 @@ class PurchaseSuccessScreenState<T> extends BaseState<PurchaseSuccessScreen> {
     return new EdgeInsets.only(bottom: bottom, left: side, right: side);
   }
 
-  getScanButton() async {
+  getScanButton() {
     String title = StringsLocalization.scan();
-    String token = await helper.getToken();
     return buildRaisedButton(title, () => Navigator.of(context).pop(token));
   }