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diff --git a/packages/taler-harness/src/integrationtests/test-merchant-exchange-confusion.ts b/packages/taler-harness/src/integrationtests/test-merchant-exchange-confusion.ts
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+/*
+ 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 {
+  codecForMerchantOrderStatusUnpaid,
+  ConfirmPayResultType,
+  MerchantApiClient,
+  PreparePayResultType,
+} from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { URL } from "url";
+import { defaultCoinConfig } from "../harness/denomStructures.js";
+import {
+  FaultInjectedExchangeService,
+  FaultInjectedMerchantService,
+} from "../harness/faultInjection.js";
+import {
+  BankService,
+  ExchangeService,
+  generateRandomPayto,
+  GlobalTestState,
+  harnessHttpLib,
+  MerchantService,
+  setupDb,
+} from "../harness/harness.js";
+import {
+  createWalletDaemonWithClient,
+  FaultyMerchantTestEnvironment,
+  withdrawViaBankV2,
+} from "../harness/helpers.js";
+
+/**
+ * Run a test case with a simple TESTKUDOS Taler environment, consisting
+ * of one exchange, one bank and one merchant.
+ */
+export async function createConfusedMerchantTestkudosEnvironment(
+  t: GlobalTestState,
+): Promise<FaultyMerchantTestEnvironment> {
+  const db = await setupDb(t);
+
+  const bank = await BankService.create(t, {
+    allowRegistrations: true,
+    currency: "TESTKUDOS",
+    database: db.connStr,
+    httpPort: 8082,
+  });
+
+  const exchange = ExchangeService.create(t, {
+    name: "testexchange-1",
+    currency: "TESTKUDOS",
+    httpPort: 8081,
+    database: db.connStr,
+  });
+
+  const merchant = await MerchantService.create(t, {
+    name: "testmerchant-1",
+    currency: "TESTKUDOS",
+    httpPort: 8083,
+    database: db.connStr,
+  });
+
+  const faultyMerchant = new FaultInjectedMerchantService(t, merchant, 9083);
+  const faultyExchange = new FaultInjectedExchangeService(t, exchange, 9081);
+
+  // Base URL must contain port that the proxy is listening on.
+  await exchange.modifyConfig(async (config) => {
+    config.setString("exchange", "base_url", "http://localhost:9081/");
+  });
+
+  const exchangeBankAccount = await bank.createExchangeAccount(
+    "myexchange",
+    "x",
+  );
+  exchange.addBankAccount("1", exchangeBankAccount);
+
+  bank.setSuggestedExchange(
+    faultyExchange,
+    exchangeBankAccount.accountPaytoUri,
+  );
+
+  await bank.start();
+
+  await bank.pingUntilAvailable();
+
+  exchange.addOfferedCoins(defaultCoinConfig);
+
+  await exchange.start();
+  await exchange.pingUntilAvailable();
+
+  // Confuse the merchant by adding the non-proxied exchange.
+  merchant.addExchange(exchange);
+
+  await merchant.start();
+  await merchant.pingUntilAvailable();
+
+  await merchant.addInstanceWithWireAccount({
+    id: "default",
+    name: "Default Instance",
+    paytoUris: [generateRandomPayto("merchant-default")],
+  });
+
+  await merchant.addInstanceWithWireAccount({
+    id: "minst1",
+    name: "minst1",
+    paytoUris: [generateRandomPayto("minst1")],
+  });
+
+  console.log("setup done!");
+
+  const { walletClient } = await createWalletDaemonWithClient(t, {
+    name: "default",
+  });
+
+  return {
+    commonDb: db,
+    exchange,
+    merchant,
+    walletClient,
+    bank,
+    exchangeBankAccount,
+    faultyMerchant,
+    faultyExchange,
+  };
+}
+
+/**
+ * Confuse the merchant by having one URL for the same exchange in the config,
+ * but sending coins from the same exchange with a different URL.
+ */
+export async function runMerchantExchangeConfusionTest(t: GlobalTestState) {
+  // Set up test environment
+
+  const { walletClient, bank, faultyExchange, faultyMerchant } =
+    await createConfusedMerchantTestkudosEnvironment(t);
+
+  // Withdraw digital cash into the wallet.
+
+  const wres = await withdrawViaBankV2(t, {
+    walletClient,
+    bank,
+    exchange: faultyExchange,
+    amount: "TESTKUDOS:20",
+  });
+
+  await wres.withdrawalFinishedCond;
+
+  /**
+   * =========================================================================
+   * Create an order and let the wallet pay under a session ID
+   *
+   * We check along the way that the JSON response to /orders/{order_id}
+   * returns the right thing.
+   * =========================================================================
+   */
+
+  const merchant = faultyMerchant;
+
+  const merchantClient = new MerchantApiClient(merchant.makeInstanceBaseUrl());
+
+  let orderResp = await merchantClient.createOrder({
+    order: {
+      summary: "Buy me!",
+      amount: "TESTKUDOS:5",
+      fulfillment_url: "https://example.com/article42",
+    },
+  });
+
+  let orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+    sessionId: "mysession-one",
+  });
+
+  t.assertTrue(orderStatus.order_status === "unpaid");
+
+  t.assertTrue(orderStatus.already_paid_order_id === undefined);
+  let publicOrderStatusUrl = orderStatus.order_status_url;
+
+  let publicOrderStatusResp = await harnessHttpLib.fetch(publicOrderStatusUrl);
+
+  if (publicOrderStatusResp.status != 402) {
+    throw Error(
+      `expected status 402 (before claiming), but got ${publicOrderStatusResp.status}`,
+    );
+  }
+
+  let pubUnpaidStatus = codecForMerchantOrderStatusUnpaid().decode(
+    await publicOrderStatusResp.json(),
+  );
+
+  console.log(pubUnpaidStatus);
+
+  let preparePayResp = await walletClient.call(
+    WalletApiOperation.PreparePayForUri,
+    {
+      talerPayUri: pubUnpaidStatus.taler_pay_uri,
+    },
+  );
+
+  t.assertTrue(preparePayResp.status === PreparePayResultType.PaymentPossible);
+
+  const proposalId = preparePayResp.proposalId;
+
+  const orderUrlWithHash = new URL(publicOrderStatusUrl);
+  orderUrlWithHash.searchParams.set(
+    "h_contract",
+    preparePayResp.contractTermsHash,
+  );
+
+  console.log("requesting", orderUrlWithHash.href);
+
+  publicOrderStatusResp = await harnessHttpLib.fetch(orderUrlWithHash.href);
+
+  if (publicOrderStatusResp.status != 402) {
+    throw Error(
+      `expected status 402 (after claiming), but got ${publicOrderStatusResp.status}`,
+    );
+  }
+
+  pubUnpaidStatus = codecForMerchantOrderStatusUnpaid().decode(
+    await publicOrderStatusResp.json(),
+  );
+
+  const confirmPayRes = await walletClient.call(WalletApiOperation.ConfirmPay, {
+    proposalId: proposalId,
+  });
+
+  t.assertTrue(confirmPayRes.type === ConfirmPayResultType.Done);
+}
+
+runMerchantExchangeConfusionTest.suites = ["merchant"];