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diff --git a/packages/taler-harness/src/integrationtests/test-refund-incremental.ts b/packages/taler-harness/src/integrationtests/test-refund-incremental.ts
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+++ b/packages/taler-harness/src/integrationtests/test-refund-incremental.ts
@@ -0,0 +1,203 @@
+/*
+ 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 {
+  Amounts,
+  Duration,
+  MerchantApiClient,
+  TransactionType,
+} from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { GlobalTestState, delayMs } from "../harness/harness.js";
+import {
+  createSimpleTestkudosEnvironmentV2,
+  withdrawViaBankV2,
+} from "../harness/helpers.js";
+
+/**
+ * Run test for basic, bank-integrated withdrawal.
+ */
+export async function runRefundIncrementalTest(t: GlobalTestState) {
+  // Set up test environment
+
+  const { walletClient, bank, exchange, merchant } =
+    await createSimpleTestkudosEnvironmentV2(t);
+
+  const merchantClient = new MerchantApiClient(merchant.makeInstanceBaseUrl());
+
+  // Withdraw digital cash into the wallet.
+
+  const wres = await withdrawViaBankV2(t, {
+    walletClient,
+    bank,
+    exchange,
+    amount: "TESTKUDOS:20",
+  });
+
+  await wres.withdrawalFinishedCond;
+
+  // Set up order.
+
+  const orderResp = await merchantClient.createOrder({
+    order: {
+      summary: "Buy me!",
+      amount: "TESTKUDOS:10",
+      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 walletClient.call(WalletApiOperation.PreparePayForUri, {
+    talerPayUri: orderStatus.taler_pay_uri,
+  });
+
+  await walletClient.call(WalletApiOperation.ConfirmPay, {
+    proposalId: r1.proposalId,
+  });
+
+  // Check if payment was successful.
+
+  orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "paid");
+
+  let ref = await merchantClient.giveRefund({
+    amount: "TESTKUDOS:2.5",
+    instance: "default",
+    justification: "foo",
+    orderId: orderResp.order_id,
+  });
+
+  console.log("first refund increase response", ref);
+
+  {
+    let wr = await walletClient.call(WalletApiOperation.StartRefundQuery, {
+      transactionId: r1.transactionId,
+    });
+    await walletClient.call(
+      WalletApiOperation.TestingWaitTransactionsFinal,
+      {},
+    );
+    console.log(wr);
+    const txs = await walletClient.call(WalletApiOperation.GetTransactions, {});
+    console.log(
+      "transactions after applying first refund:",
+      JSON.stringify(txs, undefined, 2),
+    );
+  }
+
+  // Wait at least a second, because otherwise the increased
+  // refund will be grouped with the previous one.
+  await delayMs(1200);
+
+  ref = await merchantClient.giveRefund({
+    amount: "TESTKUDOS:5",
+    instance: "default",
+    justification: "bar",
+    orderId: orderResp.order_id,
+  });
+
+  console.log("second refund increase response", ref);
+
+  // Wait at least a second, because otherwise the increased
+  // refund will be grouped with the previous one.
+  await delayMs(1200);
+
+  ref = await merchantClient.giveRefund({
+    amount: "TESTKUDOS:10",
+    instance: "default",
+    justification: "bar",
+    orderId: orderResp.order_id,
+  });
+
+  console.log("third refund increase response", ref);
+
+  {
+    let wr = await walletClient.call(WalletApiOperation.StartRefundQuery, {
+      transactionId: r1.transactionId,
+    });
+    await walletClient.call(
+      WalletApiOperation.TestingWaitTransactionsFinal,
+      {},
+    );
+    console.log(wr);
+  }
+
+  orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "paid");
+
+  t.assertAmountEquals(orderStatus.refund_amount, "TESTKUDOS:10");
+
+  console.log(JSON.stringify(orderStatus, undefined, 2));
+
+  await walletClient.call(WalletApiOperation.TestingWaitTransactionsFinal, {});
+
+  const bal = await walletClient.call(WalletApiOperation.GetBalances, {});
+  console.log(JSON.stringify(bal, undefined, 2));
+
+  {
+    const txs = await walletClient.call(WalletApiOperation.GetTransactions, {});
+    console.log(JSON.stringify(txs, undefined, 2));
+
+    const txTypes = txs.transactions.map((x) => x.type);
+    t.assertDeepEqual(txTypes, ["withdrawal", "payment", "refund", "refund"]);
+
+    for (const tx of txs.transactions) {
+      if (tx.type !== TransactionType.Refund) {
+        continue;
+      }
+      t.assertAmountLeq(tx.amountEffective, tx.amountRaw);
+    }
+
+    const raw = Amounts.sum(
+      txs.transactions
+        .filter((x) => x.type === TransactionType.Refund)
+        .map((x) => x.amountRaw),
+    ).amount;
+
+    t.assertAmountEquals("TESTKUDOS:10", raw);
+
+    const effective = Amounts.sum(
+      txs.transactions
+        .filter((x) => x.type === TransactionType.Refund)
+        .map((x) => x.amountEffective),
+    ).amount;
+
+    t.assertAmountEquals("TESTKUDOS:8.59", effective);
+  }
+
+  await t.shutdown();
+}
+
+runRefundIncrementalTest.suites = ["wallet"];