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diff --git a/packages/taler-wallet-cli/src/integrationtests/test-payment-idempotency.ts b/packages/taler-wallet-cli/src/integrationtests/test-payment-idempotency.ts
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+++ b/packages/taler-wallet-cli/src/integrationtests/test-payment-idempotency.ts
@@ -0,0 +1,103 @@
+/*
+ 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 { GlobalTestState, MerchantPrivateApi } from "./harness";
+import { createSimpleTestkudosEnvironment, withdrawViaBank } from "./helpers";
+import { PreparePayResultType } from "taler-wallet-core";
+
+/**
+ * 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 {
+    wallet,
+    bank,
+    exchange,
+    merchant,
+  } = await createSimpleTestkudosEnvironment(t);
+
+  // Withdraw digital cash into the wallet.
+
+  await withdrawViaBank(t, { wallet, bank, exchange, amount: "TESTKUDOS:20" });
+
+  // Set up order.
+
+  const orderResp = await MerchantPrivateApi.createOrder(merchant, "default", {
+    order: {
+      summary: "Buy me!",
+      amount: "TESTKUDOS:5",
+      fulfillment_url: "taler://fulfillment-success/thx",
+    },
+  });
+
+  let orderStatus = await MerchantPrivateApi.queryPrivateOrderStatus(merchant, {
+    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 wallet.preparePay({
+    talerPayUri: orderStatus.taler_pay_uri,
+  });
+
+  const preparePayResultRep = await wallet.preparePay({
+    talerPayUri: orderStatus.taler_pay_uri,
+  });
+
+  t.assertTrue(
+    preparePayResult.status === PreparePayResultType.PaymentPossible,
+  );
+  t.assertTrue(
+    preparePayResultRep.status === PreparePayResultType.PaymentPossible,
+  );
+
+  const proposalId = preparePayResult.proposalId;
+
+  const r2 = await wallet.apiRequest("confirmPay", {
+    // FIXME: should be validated, don't cast!
+    proposalId: proposalId,
+  });
+  t.assertTrue(r2.type === "response");
+
+  // Check if payment was successful.
+
+  orderStatus = await MerchantPrivateApi.queryPrivateOrderStatus(merchant, {
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "paid");
+
+  const preparePayResultAfter = await wallet.preparePay({
+    talerPayUri,
+  });
+
+  t.assertTrue(
+    preparePayResultAfter.status === PreparePayResultType.AlreadyConfirmed,
+  );
+  t.assertTrue(preparePayResultAfter.paid === true);
+
+  await t.shutdown();
+}