diff --git a/packages/taler-integrationtests/src/test-merchant-refund-api.ts b/packages/taler-integrationtests/src/test-merchant-refund-api.ts
new file mode 100644
index 000000000..61f08780c
--- /dev/null
+++ b/packages/taler-integrationtests/src/test-merchant-refund-api.ts
@@ -0,0 +1,137 @@
+/*
+ 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 } from "./helpers";
+import { PreparePayResultType, URL } from "taler-wallet-core";
+import axios from "axios";
+
+/**
+ * Test case for the refund API of the merchant backend.
+ */
+runTest(async (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;
+  const orderId = orderResp.order_id;
+
+  // Make wallet pay for the order
+
+  let preparePayResult = await wallet.preparePay({
+    talerPayUri,
+  });
+
+  t.assertTrue(
+    preparePayResult.status === PreparePayResultType.PaymentPossible,
+  );
+
+  const r2 = await wallet.apiRequest("confirmPay", {
+    proposalId: preparePayResult.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");
+
+  preparePayResult = await wallet.preparePay({
+    talerPayUri,
+  });
+
+  t.assertTrue(
+    preparePayResult.status === PreparePayResultType.AlreadyConfirmed,
+  );
+
+  await MerchantPrivateApi.giveRefund(merchant, {
+    amount: "TESTKUDOS:5",
+    instance: "default",
+    justification: "foo",
+    orderId: orderResp.order_id,
+  });
+
+  orderStatus = await MerchantPrivateApi.queryPrivateOrderStatus(merchant, {
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "paid");
+
+  t.assertAmountEquals(orderStatus.refund_amount, "TESTKUDOS:5");
+
+  // Now test what the merchant gives as a response for various requests to the
+  // public order status URL!
+
+  let publicOrderStatusUrl = new URL(
+    `orders/${orderId}`,
+    merchant.makeInstanceBaseUrl(),
+  );
+  publicOrderStatusUrl.searchParams.set(
+    "h_contract",
+    preparePayResult.contractTermsHash,
+  );
+
+  let publicOrderStatusResp = await axios.get(publicOrderStatusUrl.href, {
+    validateStatus: () => true,
+  });
+  console.log(publicOrderStatusResp.data);
+  t.assertTrue(publicOrderStatusResp.status === 200);
+  t.assertAmountEquals(publicOrderStatusResp.data.refund_amount, "TESTKUDOS:5");
+
+  publicOrderStatusUrl = new URL(
+    `orders/${orderId}`,
+    merchant.makeInstanceBaseUrl(),
+  );
+
+  publicOrderStatusResp = await axios.get(publicOrderStatusUrl.href, {
+    validateStatus: () => true,
+  });
+  console.log(publicOrderStatusResp.data)
+  // We didn't give any authentication, so this should be forbidden
+  t.assertTrue(publicOrderStatusResp.status === 403);
+});
diff --git a/packages/taler-wallet-core/src/operations/pay.ts b/packages/taler-wallet-core/src/operations/pay.ts
index 327a6c804..565fe9c66 100644
--- a/packages/taler-wallet-core/src/operations/pay.ts
+++ b/packages/taler-wallet-core/src/operations/pay.ts
@@ -1052,6 +1052,7 @@ export async function preparePayForUri(
     return {
       status: PreparePayResultType.AlreadyConfirmed,
       contractTerms: JSON.parse(purchase.contractTermsRaw),
+      contractTermsHash: purchase.contractData.contractTermsHash,
       paid: true,
       nextUrl: r.nextUrl,
       amountRaw: Amounts.stringify(purchase.contractData.amount),
@@ -1061,6 +1062,7 @@ export async function preparePayForUri(
     return {
       status: PreparePayResultType.AlreadyConfirmed,
       contractTerms: JSON.parse(purchase.contractTermsRaw),
+      contractTermsHash: purchase.contractData.contractTermsHash,
       paid: false,
       amountRaw: Amounts.stringify(purchase.contractData.amount),
       amountEffective: Amounts.stringify(purchase.payCostInfo.totalCost),
@@ -1070,6 +1072,7 @@ export async function preparePayForUri(
     return {
       status: PreparePayResultType.AlreadyConfirmed,
       contractTerms: JSON.parse(purchase.contractTermsRaw),
+      contractTermsHash: purchase.contractData.contractTermsHash,
       paid,
       amountRaw: Amounts.stringify(purchase.contractData.amount),
       amountEffective: Amounts.stringify(purchase.payCostInfo.totalCost),
diff --git a/packages/taler-wallet-core/src/types/walletTypes.ts b/packages/taler-wallet-core/src/types/walletTypes.ts
index 511d7766c..921c63a1e 100644
--- a/packages/taler-wallet-core/src/types/walletTypes.ts
+++ b/packages/taler-wallet-core/src/types/walletTypes.ts
@@ -422,6 +422,7 @@ export const codecForPreparePayResultAlreadyConfirmed = (): Codec<
     .property("nextUrl", codecForString())
     .property("paid", codecForBoolean)
     .property("contractTerms", codecForAny())
+    .property("contractTermsHash", codecForString())
     .build("PreparePayResultAlreadyConfirmed");
 
 export const codecForPreparePayResult = (): Codec<PreparePayResult> =>
@@ -469,6 +470,8 @@ export interface PreparePayResultAlreadyConfirmed {
   amountEffective: string;
   // Only specified if paid.
   nextUrl?: string;
+
+  contractTermsHash: string;
 }
 
 export interface BankWithdrawDetails {