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diff --git a/packages/taler-harness/src/integrationtests/test-refund.ts b/packages/taler-harness/src/integrationtests/test-refund.ts
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+++ b/packages/taler-harness/src/integrationtests/test-refund.ts
@@ -0,0 +1,149 @@
+/*
+ This file is part of GNU Taler
+ (C) 2020-2024 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,
+  MerchantApiClient,
+  NotificationType,
+  TransactionMajorState,
+  TransactionType,
+} 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";
+
+export async function runRefundTest(t: GlobalTestState) {
+  // Set up test environment
+
+  const {
+    walletClient: wallet,
+    bank,
+    exchange,
+    merchant,
+  } = await createSimpleTestkudosEnvironmentV2(t);
+
+  const merchantClient = new MerchantApiClient(merchant.makeInstanceBaseUrl());
+
+  // Withdraw digital cash into the wallet.
+
+  const withdrawalRes = await withdrawViaBankV2(t, {
+    walletClient: wallet,
+    bank,
+    exchange,
+    amount: "TESTKUDOS:20",
+  });
+
+  await withdrawalRes.withdrawalFinishedCond;
+
+  // Set up order.
+  const orderResp = await merchantClient.createOrder({
+    order: {
+      summary: "Buy me!",
+      amount: "TESTKUDOS:5",
+      fulfillment_url: "taler://fulfillment-success/thx",
+    },
+    refund_delay: Duration.toTalerProtocolDuration(
+      Duration.fromSpec({ minutes: 5 }),
+    ),
+  });
+
+  let orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "unpaid");
+
+  // Make wallet pay for the order
+
+  const r1 = await wallet.client.call(WalletApiOperation.PreparePayForUri, {
+    talerPayUri: orderStatus.taler_pay_uri,
+  });
+
+  await wallet.client.call(WalletApiOperation.ConfirmPay, {
+    transactionId: r1.transactionId,
+  });
+
+  // Check if payment was successful.
+
+  orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "paid");
+
+  {
+    const tx = await wallet.client.call(WalletApiOperation.GetTransactionById, {
+      transactionId: r1.transactionId,
+    });
+
+    t.assertTrue(
+      tx.type === TransactionType.Payment && tx.refundPending === undefined,
+    );
+  }
+
+  const ref = await merchantClient.giveRefund({
+    amount: "TESTKUDOS:5",
+    instance: "default",
+    justification: "foo",
+    orderId: orderResp.order_id,
+  });
+
+  console.log(ref);
+
+  {
+    const refundFinishedCond = wallet.waitForNotificationCond(
+      (x) =>
+        x.type === NotificationType.TransactionStateTransition &&
+        x.transactionId === r1.transactionId &&
+        x.newTxState.major === TransactionMajorState.Done,
+    );
+    await wallet.client.call(WalletApiOperation.StartRefundQuery, {
+      transactionId: r1.transactionId,
+    });
+    await refundFinishedCond;
+  }
+
+  {
+    const r2 = await wallet.client.call(WalletApiOperation.GetBalances, {});
+    console.log(JSON.stringify(r2, undefined, 2));
+  }
+
+  {
+    const r2 = await wallet.client.call(WalletApiOperation.GetTransactions, {});
+    console.log(JSON.stringify(r2, undefined, 2));
+  }
+
+  {
+    const tx = await wallet.client.call(WalletApiOperation.GetTransactionById, {
+      transactionId: r1.transactionId,
+    });
+
+    console.log(j2s(tx));
+
+    t.assertTrue(
+      tx.type === TransactionType.Payment && tx.refundPending === undefined,
+    );
+  }
+}
+
+runRefundTest.suites = ["wallet"];