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diff --git a/packages/taler-integrationtests/src/test-pay-paid.ts b/packages/taler-integrationtests/src/test-pay-paid.ts
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+++ b/packages/taler-integrationtests/src/test-pay-paid.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 { runTest, GlobalTestState, MerchantPrivateApi } from "./harness";
+import { createSimpleTestkudosEnvironment, withdrawViaBank, createFaultInjectedMerchantTestkudosEnvironment } from "./helpers";
+import {
+  PreparePayResultType,
+  codecForMerchantOrderStatusUnpaid,
+  ConfirmPayResultType,
+  URL,
+} from "taler-wallet-core";
+import axios from "axios";
+import { FaultInjectionRequestContext } from "./faultInjection";
+
+/**
+ * Run test for basic, bank-integrated withdrawal.
+ */
+runTest(async (t: GlobalTestState) => {
+  // Set up test environment
+
+  const {
+    wallet,
+    bank,
+    exchange,
+    faultyMerchant,
+  } = await createFaultInjectedMerchantTestkudosEnvironment(t);
+
+  // Withdraw digital cash into the wallet.
+
+  await withdrawViaBank(t, { wallet, bank, exchange, amount: "TESTKUDOS:20" });
+
+  /**
+   * =========================================================================
+   * 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;
+
+  let orderResp = await MerchantPrivateApi.createOrder(merchant, "default", {
+    order: {
+      summary: "Buy me!",
+      amount: "TESTKUDOS:5",
+      fulfillment_url: "https://example.com/article42",
+    },
+  });
+
+
+  let orderStatus = await MerchantPrivateApi.queryPrivateOrderStatus(merchant, {
+    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 axios.get(publicOrderStatusUrl, {
+    validateStatus: () => true,
+  });
+
+  if (publicOrderStatusResp.status != 402) {
+    throw Error(
+      `expected status 402 (before claiming), but got ${publicOrderStatusResp.status}`,
+    );
+  }
+
+  let pubUnpaidStatus = codecForMerchantOrderStatusUnpaid().decode(
+    publicOrderStatusResp.data,
+  );
+
+  console.log(pubUnpaidStatus);
+
+  let preparePayResp = await wallet.preparePay({
+    talerPayUri: pubUnpaidStatus.taler_pay_uri,
+  });
+
+  t.assertTrue(preparePayResp.status === PreparePayResultType.PaymentPossible);
+
+  const proposalId = preparePayResp.proposalId;
+
+  publicOrderStatusResp = await axios.get(publicOrderStatusUrl, {
+    validateStatus: () => true,
+  });
+
+  if (publicOrderStatusResp.status != 402) {
+    throw Error(
+      `expected status 402 (after claiming), but got ${publicOrderStatusResp.status}`,
+    );
+  }
+
+  pubUnpaidStatus = codecForMerchantOrderStatusUnpaid().decode(
+    publicOrderStatusResp.data,
+  );
+
+  const confirmPayRes = await wallet.confirmPay({
+    proposalId: proposalId,
+  });
+
+  t.assertTrue(confirmPayRes.type === ConfirmPayResultType.Done);
+
+  publicOrderStatusResp = await axios.get(publicOrderStatusUrl, {
+    validateStatus: () => true,
+  });
+
+  console.log(publicOrderStatusResp.data);
+
+  if (publicOrderStatusResp.status != 202) {
+    console.log(publicOrderStatusResp.data);
+    throw Error(
+      `expected status 202 (after paying), but got ${publicOrderStatusResp.status}`,
+    );
+  }
+
+  /**
+   * =========================================================================
+   * Now change up the session ID and do payment re-play!
+   * =========================================================================
+   */
+
+  orderStatus = await MerchantPrivateApi.queryPrivateOrderStatus(merchant, {
+    orderId: orderResp.order_id,
+    sessionId: "mysession-two",
+  });
+
+  // Should be unpaid because of a new session ID
+  t.assertTrue(orderStatus.order_status === "unpaid");
+
+  publicOrderStatusUrl = orderStatus.order_status_url;
+
+  let numPayRequested = 0;
+  let numPaidRequested = 0;
+
+  faultyMerchant.faultProxy.addFault({
+    modifyRequest(ctx: FaultInjectionRequestContext) {
+      const url = new URL(ctx.requestUrl);
+      if (url.pathname.endsWith("/pay")) {
+        numPayRequested++;
+      } else if (url.pathname.endsWith("/paid")) {
+        numPaidRequested++;
+      }
+    }
+  });
+
+  // Pay with new taler://pay URI, which should
+  // have the new session ID!
+  // Wallet should now automatically re-play payment.
+  preparePayResp = await wallet.preparePay({
+    talerPayUri: orderStatus.taler_pay_uri,
+  });
+
+  t.assertTrue(preparePayResp.status === PreparePayResultType.AlreadyConfirmed);
+  t.assertTrue(preparePayResp.paid);
+
+  // Make sure the wallet is actually doing the replay properly.
+  t.assertTrue(numPaidRequested == 1);
+  t.assertTrue(numPayRequested == 0);
+
+});