Frontend first draft

frontend/pshared/lib/models/payment/status.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/widgets.dart';
+import 'package:pshared/generated/i18n/ps_localizations.dart';
+
+enum OperationStatus {
+  processing,
+  success,
+  error,
+}
+
+
+extension OperationStatusX on OperationStatus {
+  /// Returns the localized string for this status,
+  /// e.g. “Processing”, “Success”, “Error”.
+  String localized(BuildContext context) {
+    final loc = PSLocalizations.of(context)!;
+    switch (this) {
+      case OperationStatus.processing:
+        return loc.operationStatusProcessing;
+      case OperationStatus.success:
+        return loc.operationStatusSuccess;
+      case OperationStatus.error:
+        return loc.operationStatusError;
+    }
+  }
+}