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diff --git a/packages/demobank-ui/src/pages/AccountPage/index.ts b/packages/demobank-ui/src/pages/AccountPage/index.ts
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+++ b/packages/demobank-ui/src/pages/AccountPage/index.ts
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+/*
+ This file is part of GNU Taler
+ (C) 2022 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { HttpError, HttpResponseOk, HttpResponsePaginated, utils } from "@gnu-taler/web-util/browser";
+import { AbsoluteTime, AmountJson, PaytoUriIBAN } from "@gnu-taler/taler-util";
+import { Loading } from "../../components/Loading.js";
+import { useComponentState } from "./state.js";
+import { ReadyView, InvalidIbanView} from "./views.js";
+import { VNode } from "preact";
+import { LoginForm } from "../LoginForm.js";
+import { ErrorLoading } from "../../components/ErrorLoading.js";
+
+export interface Props {
+  account: string;
+  onLoadNotOk: <T>(
+    error: HttpResponsePaginated<T, SandboxBackend.SandboxError>,
+  ) => VNode;
+}
+
+export type State = State.Loading | State.LoadingError | State.Ready | State.InvalidIban | State.UserNotFound;
+
+export namespace State {
+  export interface Loading {
+    status: "loading";
+    error: undefined;
+  }
+
+  export interface LoadingError {
+    status: "loading-error";
+    error: HttpError<SandboxBackend.SandboxError>;
+  }
+
+  export interface BaseInfo {
+    error: undefined;
+  }
+  
+  export interface Ready extends BaseInfo {
+    status: "ready";
+    error: undefined;
+    account: string, 
+    payto: PaytoUriIBAN, 
+    balance: AmountJson, 
+    balanceIsDebit: boolean, 
+    limit: AmountJson,
+  }
+
+  export interface InvalidIban {
+    status: "invalid-iban",
+    error: HttpResponseOk<SandboxBackend.Access.BankAccountBalanceResponse>;
+  }
+
+  export interface UserNotFound {
+    status: "error-user-not-found",
+    error: HttpError<any>;
+    onRegister?: () => void;
+  }
+}
+
+export interface Transaction {
+  negative: boolean;
+  counterpart: string;
+  when: AbsoluteTime;
+  amount: AmountJson | undefined;
+  subject: string;
+}
+
+const viewMapping: utils.StateViewMap<State> = {
+  loading: Loading,
+  "error-user-not-found": LoginForm,
+  "invalid-iban": InvalidIbanView,
+  "loading-error": ErrorLoading,
+  ready: ReadyView,
+};
+
+export const AccountPage = utils.compose(
+  (p: Props) => useComponentState(p),
+  viewMapping,
+);