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diff --git a/packages/taler-harness/src/integrationtests/test-currency-scope.ts b/packages/taler-harness/src/integrationtests/test-currency-scope.ts
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+++ b/packages/taler-harness/src/integrationtests/test-currency-scope.ts
@@ -0,0 +1,191 @@
+/*
+ This file is part of GNU Taler
+ (C) 2020 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/>
+ */
+
+/**
+ * Imports.
+ */
+import { Duration, j2s } from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { defaultCoinConfig } from "../harness/denomStructures.js";
+import {
+  BankService,
+  ExchangeService,
+  GlobalTestState,
+  MerchantService,
+  generateRandomPayto,
+  setupDb,
+} from "../harness/harness.js";
+import {
+  createWalletDaemonWithClient,
+  withdrawViaBankV2,
+} from "../harness/helpers.js";
+
+/**
+ * Run test for basic, bank-integrated withdrawal and payment.
+ */
+export async function runCurrencyScopeTest(t: GlobalTestState) {
+  // Set up test environment
+  const dbDefault = await setupDb(t);
+
+  const dbExchangeTwo = await setupDb(t, {
+    nameSuffix: "exchange2",
+  });
+
+  const bank = await BankService.create(t, {
+    allowRegistrations: true,
+    currency: "TESTKUDOS",
+    database: dbDefault.connStr,
+    httpPort: 8082,
+  });
+
+  const exchangeOne = ExchangeService.create(t, {
+    name: "testexchange-1",
+    currency: "TESTKUDOS",
+    httpPort: 8081,
+    database: dbDefault.connStr,
+  });
+
+  const exchangeTwo = ExchangeService.create(t, {
+    name: "testexchange-2",
+    currency: "TESTKUDOS",
+    httpPort: 8281,
+    database: dbExchangeTwo.connStr,
+  });
+
+  const merchant = await MerchantService.create(t, {
+    name: "testmerchant-1",
+    currency: "TESTKUDOS",
+    httpPort: 8083,
+    database: dbDefault.connStr,
+  });
+
+  const exchangeOneBankAccount = await bank.createExchangeAccount(
+    "myexchange",
+    "x",
+  );
+  await exchangeOne.addBankAccount("1", exchangeOneBankAccount);
+
+  const exchangeTwoBankAccount = await bank.createExchangeAccount(
+    "myexchange2",
+    "x",
+  );
+  await exchangeTwo.addBankAccount("1", exchangeTwoBankAccount);
+
+  bank.setSuggestedExchange(
+    exchangeOne,
+    exchangeOneBankAccount.accountPaytoUri,
+  );
+
+  await bank.start();
+
+  await bank.pingUntilAvailable();
+
+  // Set up the first exchange
+
+  exchangeOne.addOfferedCoins(defaultCoinConfig);
+  await exchangeOne.start();
+  await exchangeOne.pingUntilAvailable();
+
+  // Set up the second exchange
+
+  exchangeTwo.addOfferedCoins(defaultCoinConfig);
+  await exchangeTwo.start();
+  await exchangeTwo.pingUntilAvailable();
+
+  // Start and configure merchant
+
+  merchant.addExchange(exchangeOne);
+  merchant.addExchange(exchangeTwo);
+
+  await merchant.start();
+  await merchant.pingUntilAvailable();
+
+  await merchant.addInstanceWithWireAccount({
+    id: "default",
+    name: "Default Instance",
+    paytoUris: [generateRandomPayto("merchant-default")],
+    defaultWireTransferDelay: Duration.toTalerProtocolDuration(
+      Duration.fromSpec({ minutes: 1 }),
+    ),
+  });
+
+  await merchant.addInstanceWithWireAccount({
+    id: "minst1",
+    name: "minst1",
+    paytoUris: [generateRandomPayto("minst1")],
+    defaultWireTransferDelay: Duration.toTalerProtocolDuration(
+      Duration.fromSpec({ minutes: 1 }),
+    ),
+  });
+
+  const { walletClient } = await createWalletDaemonWithClient(t, {
+    name: "wallet",
+  });
+
+  console.log("setup done!");
+
+  // Withdraw digital cash into the wallet.
+
+  const w1 = await withdrawViaBankV2(t, {
+    walletClient,
+    bank,
+    exchange: exchangeOne,
+    amount: "TESTKUDOS:6",
+  });
+
+  const w2 = await withdrawViaBankV2(t, {
+    walletClient,
+    bank,
+    exchange: exchangeTwo,
+    amount: "TESTKUDOS:6",
+  });
+
+  await w1.withdrawalFinishedCond;
+  await w2.withdrawalFinishedCond;
+
+  const bal = await walletClient.call(WalletApiOperation.GetBalances, {});
+  console.log(j2s(bal));
+
+  // Separate balances, exchange-scope.
+  t.assertDeepEqual(bal.balances.length, 2);
+
+  await walletClient.call(WalletApiOperation.AddGlobalCurrencyExchange, {
+    currency: "TESTKUDOS",
+    exchangeBaseUrl: exchangeOne.baseUrl,
+    exchangeMasterPub: exchangeOne.masterPub,
+  });
+
+  await walletClient.call(WalletApiOperation.AddGlobalCurrencyExchange, {
+    currency: "TESTKUDOS",
+    exchangeBaseUrl: exchangeTwo.baseUrl,
+    exchangeMasterPub: exchangeTwo.masterPub,
+  });
+
+  const ex = walletClient.call(
+    WalletApiOperation.ListGlobalCurrencyExchanges,
+    {},
+  );
+  console.log("global currency exchanges:");
+  console.log(j2s(ex));
+
+  const bal2 = await walletClient.call(WalletApiOperation.GetBalances, {});
+  console.log(j2s(bal2));
+
+  // Global currencies are merged
+  t.assertDeepEqual(bal2.balances.length, 1);
+}
+
+runCurrencyScopeTest.suites = ["wallet"];