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diff --git a/packages/taler-harness/src/integrationtests/test-payment-idempotency.ts b/packages/taler-harness/src/integrationtests/test-payment-idempotency.ts
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+++ b/packages/taler-harness/src/integrationtests/test-payment-idempotency.ts
@@ -0,0 +1,130 @@
+/*
+ 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 { MerchantApiClient, PreparePayResultType } from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { GlobalTestState } from "../harness/harness.js";
+import {
+  createSimpleTestkudosEnvironmentV2,
+  withdrawViaBankV2,
+} from "../harness/helpers.js";
+
+/**
+ * Test the wallet-core payment API, especially that repeated operations
+ * return the expected result.
+ */
+export async function runPaymentIdempotencyTest(t: GlobalTestState) {
+  // Set up test environment
+
+  const { walletClient, bank, exchange, merchant } =
+    await createSimpleTestkudosEnvironmentV2(t);
+
+  // Withdraw digital cash into the wallet.
+
+  const wres = await withdrawViaBankV2(t, {
+    walletClient,
+    bank,
+    exchange,
+    amount: "TESTKUDOS:20",
+  });
+
+  await wres.withdrawalFinishedCond;
+
+  const merchantClient = new MerchantApiClient(merchant.makeInstanceBaseUrl());
+
+  // Set up order.
+
+  const orderResp = await merchantClient.createOrder({
+    order: {
+      summary: "Buy me!",
+      amount: "TESTKUDOS:5",
+      fulfillment_url: "taler://fulfillment-success/thx",
+    },
+  });
+
+  let orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "unpaid");
+
+  const talerPayUri = orderStatus.taler_pay_uri;
+
+  // Make wallet pay for the order
+
+  const preparePayResult = await walletClient.call(
+    WalletApiOperation.PreparePayForUri,
+    {
+      talerPayUri: orderStatus.taler_pay_uri,
+    },
+  );
+
+  const preparePayResultRep = await walletClient.call(
+    WalletApiOperation.PreparePayForUri,
+    {
+      talerPayUri: orderStatus.taler_pay_uri,
+    },
+  );
+
+  t.assertTrue(
+    preparePayResult.status === PreparePayResultType.PaymentPossible,
+  );
+  t.assertTrue(
+    preparePayResultRep.status === PreparePayResultType.PaymentPossible,
+  );
+
+  const proposalId = preparePayResult.proposalId;
+
+  const confirmPayResult = await walletClient.call(
+    WalletApiOperation.ConfirmPay,
+    {
+      proposalId: proposalId,
+    },
+  );
+
+  console.log("confirm pay result", confirmPayResult);
+
+  await walletClient.call(WalletApiOperation.TestingWaitTransactionsFinal, {});
+
+  // Check if payment was successful.
+
+  orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "paid");
+
+  const preparePayResultAfter = await walletClient.call(
+    WalletApiOperation.PreparePayForUri,
+    {
+      talerPayUri,
+    },
+  );
+
+  console.log("result after:", preparePayResultAfter);
+
+  t.assertTrue(
+    preparePayResultAfter.status === PreparePayResultType.AlreadyConfirmed,
+  );
+  t.assertTrue(preparePayResultAfter.paid === true);
+
+  await t.shutdown();
+}
+
+runPaymentIdempotencyTest.suites = ["wallet"];