diff --git a/packages/taler-harness/src/harness/harness.ts b/packages/taler-harness/src/harness/harness.ts
index a16cef7ba..df3c9b215 100644
--- a/packages/taler-harness/src/harness/harness.ts
+++ b/packages/taler-harness/src/harness/harness.ts
@@ -57,6 +57,8 @@ import {
   WalletNotification,
   codecForAny,
   AccountAddDetails,
+  MerchantInstanceConfig,
+  PartialMerchantInstanceConfig,
 } from "@gnu-taler/taler-util";
 import {
   createPlatformHttpLib,
@@ -1339,23 +1341,12 @@ export interface MerchantConfig {
   overrideTestDir?: string;
 }
 
-export interface PrivateOrderStatusQuery {
-  instance?: string;
-  orderId: string;
-  sessionId?: string;
-}
-
 export interface MerchantServiceInterface {
   makeInstanceBaseUrl(instanceName?: string): string;
   readonly port: number;
   readonly name: string;
 }
 
-export interface DeleteTippingReserveArgs {
-  reservePub: string;
-  purge?: boolean;
-}
-
 /**
  * Default HTTP client handle for the integration test harness.
  */
@@ -1364,232 +1355,6 @@ export const harnessHttpLib = createPlatformHttpLib({
   enableThrottling: false,
 });
 
-/**
- * FIXME: Move this out of the harness.
- */
-export class MerchantApiClient {
-  /**
-   * Base URL for the particular instance that this merchant API client
-   * is for.
-   */
-  private baseUrl: string;
-
-  readonly auth: MerchantAuthConfiguration;
-
-  constructor(baseUrl: string, auth?: MerchantAuthConfiguration) {
-    this.baseUrl = baseUrl;
-
-    this.auth = auth ?? {
-      method: "external",
-    };
-  }
-
-  httpClient = createPlatformHttpLib({
-    allowHttp: true,
-    enableThrottling: false,
-  });
-
-  async changeAuth(auth: MerchantAuthConfiguration): Promise<void> {
-    const url = new URL("private/auth", this.baseUrl);
-    const res = await this.httpClient.fetch(url.href, {
-      method: "POST",
-      body: auth,
-      headers: this.makeAuthHeader(),
-    });
-    await expectSuccessResponseOrThrow(res);
-  }
-
-  async deleteTippingReserve(req: DeleteTippingReserveArgs): Promise<void> {
-    const url = new URL(`private/reserves/${req.reservePub}`, this.baseUrl);
-    if (req.purge) {
-      url.searchParams.set("purge", "YES");
-    }
-    const resp = await this.httpClient.fetch(url.href, {
-      method: "DELETE",
-      headers: this.makeAuthHeader(),
-    });
-    logger.info(`delete status: ${resp.status}`);
-    return;
-  }
-
-  async createTippingReserve(
-    req: CreateMerchantTippingReserveRequest,
-  ): Promise<MerchantReserveCreateConfirmation> {
-    const url = new URL("private/reserves", this.baseUrl);
-    const resp = await this.httpClient.fetch(url.href, {
-      method: "POST",
-      body: req,
-      headers: this.makeAuthHeader(),
-    });
-    const respData = readSuccessResponseJsonOrThrow(
-      resp,
-      codecForMerchantReserveCreateConfirmation(),
-    );
-    return respData;
-  }
-
-  async getPrivateInstanceInfo(): Promise<any> {
-    const url = new URL("private", this.baseUrl);
-    const resp = await this.httpClient.fetch(url.href, {
-      method: "GET",
-      headers: this.makeAuthHeader(),
-    });
-    return await resp.json();
-  }
-
-  async getPrivateTipReserves(): Promise<TippingReserveStatus> {
-    const url = new URL("private/reserves", this.baseUrl);
-    const resp = await this.httpClient.fetch(url.href, {
-      method: "GET",
-      headers: this.makeAuthHeader(),
-    });
-    // FIXME: Validate!
-    return await resp.json();
-  }
-
-  async deleteInstance(instanceId: string) {
-    const url = new URL(`management/instances/${instanceId}`, this.baseUrl);
-    const resp = await this.httpClient.fetch(url.href, {
-      method: "DELETE",
-      headers: this.makeAuthHeader(),
-    });
-    await expectSuccessResponseOrThrow(resp);
-  }
-
-  async createInstance(req: MerchantInstanceConfig): Promise<void> {
-    const url = new URL("management/instances", this.baseUrl);
-    await this.httpClient.fetch(url.href, {
-      method: "POST",
-      body: req,
-      headers: this.makeAuthHeader(),
-    });
-  }
-
-  async getInstances(): Promise<MerchantInstancesResponse> {
-    const url = new URL("management/instances", this.baseUrl);
-    const resp = await this.httpClient.fetch(url.href, {
-      headers: this.makeAuthHeader(),
-    });
-    return resp.json();
-  }
-
-  async getInstanceFullDetails(instanceId: string): Promise<any> {
-    const url = new URL(`management/instances/${instanceId}`, this.baseUrl);
-    try {
-      const resp = await this.httpClient.fetch(url.href, {
-        headers: this.makeAuthHeader(),
-      });
-      return resp.json();
-    } catch (e) {
-      throw e;
-    }
-  }
-
-  async createOrder(
-    req: MerchantPostOrderRequest,
-  ): Promise<MerchantPostOrderResponse> {
-    let url = new URL("private/orders", this.baseUrl);
-    const resp = await harnessHttpLib.fetch(url.href, {
-      method: "POST",
-      body: req,
-      headers: this.makeAuthHeader(),
-    });
-    return readSuccessResponseJsonOrThrow(
-      resp,
-      codecForMerchantPostOrderResponse(),
-    );
-  }
-
-  async queryPrivateOrderStatus(
-    query: PrivateOrderStatusQuery,
-  ): Promise<MerchantOrderPrivateStatusResponse> {
-    const reqUrl = new URL(`private/orders/${query.orderId}`, this.baseUrl);
-    if (query.sessionId) {
-      reqUrl.searchParams.set("session_id", query.sessionId);
-    }
-    const resp = await harnessHttpLib.fetch(reqUrl.href, {
-      headers: this.makeAuthHeader(),
-    });
-    return readSuccessResponseJsonOrThrow(
-      resp,
-      codecForMerchantOrderPrivateStatusResponse(),
-    );
-  }
-
-  async giveTip(req: RewardCreateRequest): Promise<RewardCreateConfirmation> {
-    const reqUrl = new URL(`private/tips`, this.baseUrl);
-    const resp = await harnessHttpLib.fetch(reqUrl.href, {
-      method: "POST",
-      body: req,
-    });
-    // FIXME: validate
-    return resp.json();
-  }
-
-  async queryTippingReserves(): Promise<TippingReserveStatus> {
-    const reqUrl = new URL(`private/reserves`, this.baseUrl);
-    const resp = await harnessHttpLib.fetch(reqUrl.href, {
-      headers: this.makeAuthHeader(),
-    });
-    // FIXME: validate
-    return resp.json();
-  }
-
-  async giveRefund(r: {
-    instance: string;
-    orderId: string;
-    amount: string;
-    justification: string;
-  }): Promise<{ talerRefundUri: string }> {
-    const reqUrl = new URL(`private/orders/${r.orderId}/refund`, this.baseUrl);
-    const resp = await harnessHttpLib.fetch(reqUrl.href, {
-      method: "POST",
-      body: {
-        refund: r.amount,
-        reason: r.justification,
-      },
-    });
-    const respBody = await resp.json();
-    return {
-      talerRefundUri: respBody.taler_refund_uri,
-    };
-  }
-
-  async createTemplate(req: MerchantTemplateAddDetails) {
-    let url = new URL("private/templates", this.baseUrl);
-    const resp = await harnessHttpLib.fetch(url.href, {
-      method: "POST",
-      body: req,
-      headers: this.makeAuthHeader(),
-    });
-    if (resp.status !== 204) {
-      throw Error("failed to create template");
-    }
-  }
-
-  private makeAuthHeader(): Record<string, string> {
-    switch (this.auth.method) {
-      case "external":
-        return {};
-      case "token":
-        return {
-          Authorization: `Bearer ${this.auth.token}`,
-        };
-    }
-  }
-}
-
-export interface CreateMerchantTippingReserveRequest {
-  // Amount that the merchant promises to put into the reserve
-  initial_balance: AmountString;
-
-  // Exchange the merchant intends to use for tipping
-  exchange_url: string;
-
-  // Desired wire method, for example "iban" or "x-taler-bank"
-  wire_method: string;
-}
-
 export class MerchantService implements MerchantServiceInterface {
   static fromExistingConfig(
     gc: GlobalTestState,
@@ -1814,66 +1579,6 @@ export class MerchantService implements MerchantServiceInterface {
   }
 }
 
-export interface MerchantAuthConfiguration {
-  method: "external" | "token";
-  token?: string;
-}
-
-// FIXME: Why do we need this? Describe / fix!
-export interface PartialMerchantInstanceConfig {
-  auth?: MerchantAuthConfiguration;
-  id: string;
-  name: string;
-  paytoUris: string[];
-  address?: unknown;
-  jurisdiction?: unknown;
-  defaultWireTransferDelay?: TalerProtocolDuration;
-  defaultPayDelay?: TalerProtocolDuration;
-}
-
-// FIXME: Move all these types into merchant-api-types.ts!
-
-type FacadeCredentials = NoFacadeCredentials | BasicAuthFacadeCredentials;
-interface NoFacadeCredentials {
-  type: "none";
-}
-interface BasicAuthFacadeCredentials {
-  type: "basic";
-
-  // Username to use to authenticate
-  username: string;
-
-  // Password to use to authenticate
-  password: string;
-}
-
-interface MerchantBankAccount {
-  // The payto:// URI where the wallet will send coins.
-  payto_uri: string;
-
-  // Optional base URL for a facade where the
-  // merchant backend can see incoming wire
-  // transfers to reconcile its accounting
-  // with that of the exchange. Used by
-  // taler-merchant-wirewatch.
-  credit_facade_url?: string;
-
-  // Credentials for accessing the credit facade.
-  credit_facade_credentials?: FacadeCredentials;
-}
-
-export interface MerchantInstanceConfig {
-  accounts: MerchantBankAccount[];
-  auth: MerchantAuthConfiguration;
-  id: string;
-  name: string;
-  address: unknown;
-  jurisdiction: unknown;
-  use_stefan: boolean;
-  default_wire_transfer_delay: TalerProtocolDuration;
-  default_pay_delay: TalerProtocolDuration;
-}
-
 type TestStatus = "pass" | "fail" | "skip";
 
 export interface TestRunResult {
diff --git a/packages/taler-harness/src/harness/helpers.ts b/packages/taler-harness/src/harness/helpers.ts
index 485e1baba..7b2f7d8f1 100644
--- a/packages/taler-harness/src/harness/helpers.ts
+++ b/packages/taler-harness/src/harness/helpers.ts
@@ -33,6 +33,7 @@ import {
   WalletNotification,
   TransactionMajorState,
   Logger,
+  MerchantApiClient,
 } from "@gnu-taler/taler-util";
 import {
   BankAccessApi,
@@ -53,7 +54,6 @@ import {
   FakebankService,
   getPayto,
   GlobalTestState,
-  MerchantApiClient,
   MerchantService,
   MerchantServiceInterface,
   setupDb,
diff --git a/packages/taler-harness/src/index.ts b/packages/taler-harness/src/index.ts
index 3b50acf75..ed2e545f7 100644
--- a/packages/taler-harness/src/index.ts
+++ b/packages/taler-harness/src/index.ts
@@ -24,6 +24,7 @@ import {
   decodeCrock,
   j2s,
   Logger,
+  MerchantApiClient,
   rsaBlind,
   setGlobalLogLevelFromString,
 } from "@gnu-taler/taler-util";
@@ -45,11 +46,7 @@ import { runBench2 } from "./bench2.js";
 import { runBench3 } from "./bench3.js";
 import { runEnvFull } from "./env-full.js";
 import { runEnv1 } from "./env1.js";
-import {
-  GlobalTestState,
-  MerchantApiClient,
-  runTestWithState,
-} from "./harness/harness.js";
+import { GlobalTestState, runTestWithState } from "./harness/harness.js";
 import { getTestInfo, runTests } from "./integrationtests/testrunner.js";
 import { lintExchangeDeployment } from "./lint.js";
 
diff --git a/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts b/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts
index 45a035cc4..4e096e0ea 100644
--- a/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts
+++ b/packages/taler-harness/src/integrationtests/test-age-restrictions-merchant.ts
@@ -1,6 +1,6 @@
 /*
  This file is part of GNU Taler
- (C) 2022 Taler Systems S.A.
+ (C) 2022-2023 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
@@ -23,17 +23,14 @@ import {
   WireGatewayApiClient,
 } from "@gnu-taler/taler-wallet-core";
 import { defaultCoinConfig } from "../harness/denomStructures.js";
-import {
-  getWireMethodForTest,
-  GlobalTestState,
-  MerchantApiClient,
-} from "../harness/harness.js";
+import { getWireMethodForTest, GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   createWalletDaemonWithClient,
   makeTestPaymentV2,
   withdrawViaBankV2,
 } from "../harness/helpers.js";
+import { MerchantApiClient } from "@gnu-taler/taler-util";
 
 /**
  * Run test for basic, bank-integrated withdrawal and payment.
@@ -57,9 +54,6 @@ export async function runAgeRestrictionsMerchantTest(t: GlobalTestState) {
 
   const merchantClient = new MerchantApiClient(
     merchant.makeInstanceBaseUrl("default"),
-    {
-      method: "external",
-    },
   );
 
   const { walletClient: walletClientTwo } = await createWalletDaemonWithClient(
diff --git a/packages/taler-harness/src/integrationtests/test-claim-loop.ts b/packages/taler-harness/src/integrationtests/test-claim-loop.ts
index 52841dbab..652df72ec 100644
--- a/packages/taler-harness/src/integrationtests/test-claim-loop.ts
+++ b/packages/taler-harness/src/integrationtests/test-claim-loop.ts
@@ -19,14 +19,12 @@
  */
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { URL } from "url";
-import {
-  GlobalTestState,
-  MerchantApiClient,
-} from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
 } from "../harness/helpers.js";
+import { MerchantApiClient } from "@gnu-taler/taler-util";
 
 /**
  * Run test for the merchant's order lifecycle.
diff --git a/packages/taler-harness/src/integrationtests/test-denom-unoffered.ts b/packages/taler-harness/src/integrationtests/test-denom-unoffered.ts
index a9282f394..afd0c901b 100644
--- a/packages/taler-harness/src/integrationtests/test-denom-unoffered.ts
+++ b/packages/taler-harness/src/integrationtests/test-denom-unoffered.ts
@@ -17,12 +17,13 @@
 /**
  * Imports.
  */
-import { PreparePayResultType, TalerErrorCode } from "@gnu-taler/taler-util";
-import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import {
-  GlobalTestState,
   MerchantApiClient,
-} from "../harness/harness.js";
+  PreparePayResultType,
+  TalerErrorCode,
+} from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-kyc.ts b/packages/taler-harness/src/integrationtests/test-kyc.ts
index 34ad46e03..22c8ce03c 100644
--- a/packages/taler-harness/src/integrationtests/test-kyc.ts
+++ b/packages/taler-harness/src/integrationtests/test-kyc.ts
@@ -26,11 +26,13 @@ import {
   TransactionMinorState,
   TransactionType,
 } from "@gnu-taler/taler-util";
+import { createPlatformHttpLib } from "@gnu-taler/taler-util/http";
 import {
   BankAccessApi,
   BankApi,
   WalletApiOperation,
 } from "@gnu-taler/taler-wallet-core";
+import * as http from "node:http";
 import { CoinConfig, defaultCoinConfig } from "../harness/denomStructures.js";
 import {
   BankService,
@@ -43,8 +45,6 @@ import {
   WalletService,
 } from "../harness/harness.js";
 import { EnvOptions, SimpleTestEnvironmentNg } from "../harness/helpers.js";
-import * as http from "node:http";
-import { createPlatformHttpLib } from "@gnu-taler/taler-util/http";
 
 const logger = new Logger("test-kyc.ts");
 
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-exchange-confusion.ts b/packages/taler-harness/src/integrationtests/test-merchant-exchange-confusion.ts
index 3c71e0f7e..e8f5a435a 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-exchange-confusion.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-exchange-confusion.ts
@@ -20,6 +20,7 @@
 import {
   codecForMerchantOrderStatusUnpaid,
   ConfirmPayResultType,
+  MerchantApiClient,
   PreparePayResultType,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
@@ -35,7 +36,6 @@ import {
   getPayto,
   GlobalTestState,
   harnessHttpLib,
-  MerchantApiClient,
   MerchantService,
   setupDb,
 } from "../harness/harness.js";
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-instances-delete.ts b/packages/taler-harness/src/integrationtests/test-merchant-instances-delete.ts
index 1c99dda76..ff567d33d 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-instances-delete.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-instances-delete.ts
@@ -17,17 +17,15 @@
 /**
  * Imports.
  */
-import { TalerError, URL } from "@gnu-taler/taler-util";
+import { MerchantApiClient, TalerError, URL } from "@gnu-taler/taler-util";
 import {
   ExchangeService,
   GlobalTestState,
-  MerchantApiClient,
   MerchantService,
-  setupDb,
   getPayto,
   harnessHttpLib,
+  setupDb,
 } from "../harness/harness.js";
-import { createPlatformHttpLib } from "@gnu-taler/taler-util/http";
 
 /**
  * Test instance deletion and authentication for it
@@ -69,7 +67,9 @@ export async function runMerchantInstancesDeleteTest(t: GlobalTestState) {
 
   // Instances should initially be empty
   {
-    const r = await harnessHttpLib.fetch(new URL("management/instances", baseUrl).href);
+    const r = await harnessHttpLib.fetch(
+      new URL("management/instances", baseUrl).href,
+    );
     const data = await r.json();
     t.assertDeepEqual(data.instances, []);
   }
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-instances-urls.ts b/packages/taler-harness/src/integrationtests/test-merchant-instances-urls.ts
index 18a09c76b..071288b0f 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-instances-urls.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-instances-urls.ts
@@ -17,17 +17,15 @@
 /**
  * Imports.
  */
-import { Duration } from "@gnu-taler/taler-util";
+import { Duration, MerchantApiClient } from "@gnu-taler/taler-util";
 import {
   ExchangeService,
   GlobalTestState,
-  MerchantApiClient,
   MerchantService,
-  setupDb,
   getPayto,
   harnessHttpLib,
+  setupDb,
 } from "../harness/harness.js";
-import { createPlatformHttpLib } from "@gnu-taler/taler-util/http";
 
 /**
  * Do basic checks on instance management and authentication.
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-instances.ts b/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
index 54205e9f2..fd7a8ca3a 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
@@ -17,17 +17,15 @@
 /**
  * Imports.
  */
-import { URL } from "@gnu-taler/taler-util";
+import { MerchantApiClient, URL } from "@gnu-taler/taler-util";
 import {
   ExchangeService,
   GlobalTestState,
-  MerchantApiClient,
   MerchantService,
   setupDb,
   getPayto,
   harnessHttpLib,
 } from "../harness/harness.js";
-import { createPlatformHttpLib } from "@gnu-taler/taler-util/http";
 
 /**
  * Do basic checks on instance management and authentication.
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-longpolling.ts b/packages/taler-harness/src/integrationtests/test-merchant-longpolling.ts
index d7ffa28d5..bd63a8445 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-longpolling.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-longpolling.ts
@@ -19,16 +19,13 @@
  */
 import {
   ConfirmPayResultType,
+  MerchantApiClient,
   PreparePayResultType,
   URL,
   codecForMerchantOrderStatusUnpaid,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import {
-  GlobalTestState,
-  MerchantApiClient,
-  harnessHttpLib,
-} from "../harness/harness.js";
+import { GlobalTestState, harnessHttpLib } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-refund-api.ts b/packages/taler-harness/src/integrationtests/test-merchant-refund-api.ts
index ebca4f769..369f261dd 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-refund-api.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-refund-api.ts
@@ -18,27 +18,27 @@
  * Imports.
  */
 import {
+  Duration,
+  MerchantApiClient,
+  PreparePayResultType,
+  URL,
+  durationFromSpec,
+} from "@gnu-taler/taler-util";
+import {
+  BankServiceHandle,
+  WalletApiOperation,
+} from "@gnu-taler/taler-wallet-core";
+import {
+  ExchangeServiceInterface,
   GlobalTestState,
   MerchantServiceInterface,
-  ExchangeServiceInterface,
-  harnessHttpLib,
   WalletClient,
-  MerchantApiClient,
+  harnessHttpLib,
 } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
 } from "../harness/helpers.js";
-import {
-  URL,
-  durationFromSpec,
-  PreparePayResultType,
-  Duration,
-} from "@gnu-taler/taler-util";
-import {
-  WalletApiOperation,
-  BankServiceHandle,
-} from "@gnu-taler/taler-wallet-core";
 
 async function testRefundApiWithFulfillmentUrl(
   t: GlobalTestState,
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-spec-public-orders.ts b/packages/taler-harness/src/integrationtests/test-merchant-spec-public-orders.ts
index 599a3fc16..afae8a899 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-spec-public-orders.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-spec-public-orders.ts
@@ -19,6 +19,7 @@
  */
 import {
   ConfirmPayResultType,
+  MerchantApiClient,
   PreparePayResultType,
   URL,
   encodeCrock,
@@ -29,7 +30,6 @@ import {
   BankService,
   ExchangeService,
   GlobalTestState,
-  MerchantApiClient,
   MerchantService,
   harnessHttpLib,
 } from "../harness/harness.js";
diff --git a/packages/taler-harness/src/integrationtests/test-pay-paid.ts b/packages/taler-harness/src/integrationtests/test-pay-paid.ts
index 4fe13b3ae..3d93f6e29 100644
--- a/packages/taler-harness/src/integrationtests/test-pay-paid.ts
+++ b/packages/taler-harness/src/integrationtests/test-pay-paid.ts
@@ -18,22 +18,19 @@
  * Imports.
  */
 import {
-  GlobalTestState,
+  ConfirmPayResultType,
   MerchantApiClient,
-  harnessHttpLib,
-} from "../harness/harness.js";
+  PreparePayResultType,
+  URL,
+  codecForMerchantOrderStatusUnpaid,
+} from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { FaultInjectionRequestContext } from "../harness/faultInjection.js";
+import { GlobalTestState, harnessHttpLib } from "../harness/harness.js";
 import {
   createFaultInjectedMerchantTestkudosEnvironment,
   withdrawViaBankV2,
 } from "../harness/helpers.js";
-import {
-  PreparePayResultType,
-  codecForMerchantOrderStatusUnpaid,
-  ConfirmPayResultType,
-  URL,
-} from "@gnu-taler/taler-util";
-import { FaultInjectionRequestContext } from "../harness/faultInjection.js";
-import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 
 /**
  * Run test for the wallets repurchase detection mechanism
diff --git a/packages/taler-harness/src/integrationtests/test-payment-abort.ts b/packages/taler-harness/src/integrationtests/test-payment-abort.ts
index 22e087161..3164bbaf3 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-abort.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-abort.ts
@@ -18,25 +18,22 @@
  * Imports.
  */
 import {
-  GlobalTestState,
-  MerchantApiClient,
-  harnessHttpLib,
-} from "../harness/harness.js";
-import {
-  createFaultInjectedMerchantTestkudosEnvironment,
-  withdrawViaBankV2,
-} from "../harness/helpers.js";
-import { FaultInjectionRequestContext } from "../harness/faultInjection.js";
-import {
-  codecForMerchantOrderStatusUnpaid,
   ConfirmPayResultType,
-  j2s,
+  MerchantApiClient,
   PreparePayResultType,
   TalerErrorCode,
   TalerErrorDetail,
   URL,
+  codecForMerchantOrderStatusUnpaid,
+  j2s,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { FaultInjectionRequestContext } from "../harness/faultInjection.js";
+import { GlobalTestState, harnessHttpLib } from "../harness/harness.js";
+import {
+  createFaultInjectedMerchantTestkudosEnvironment,
+  withdrawViaBankV2,
+} from "../harness/helpers.js";
 
 export async function runPaymentAbortTest(t: GlobalTestState) {
   // Set up test environment
diff --git a/packages/taler-harness/src/integrationtests/test-payment-claim.ts b/packages/taler-harness/src/integrationtests/test-payment-claim.ts
index df86b3cbf..b5ed89ec3 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-claim.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-claim.ts
@@ -17,9 +17,13 @@
 /**
  * Imports.
  */
-import { PreparePayResultType, TalerErrorCode } from "@gnu-taler/taler-util";
+import {
+  MerchantApiClient,
+  PreparePayResultType,
+  TalerErrorCode,
+} from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient, WalletCli } from "../harness/harness.js";
+import { GlobalTestState, WalletCli } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-payment-expired.ts b/packages/taler-harness/src/integrationtests/test-payment-expired.ts
index 4817efba5..176fc74f7 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-expired.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-expired.ts
@@ -17,21 +17,22 @@
 /**
  * Imports.
  */
+import {
+  AbsoluteTime,
+  ConfirmPayResultType,
+  Duration,
+  MerchantApiClient,
+  MerchantContractTerms,
+  PreparePayResultType,
+  j2s,
+} from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   applyTimeTravelV2,
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
 } from "../harness/helpers.js";
-import {
-  AbsoluteTime,
-  ConfirmPayResultType,
-  Duration,
-  MerchantContractTerms,
-  PreparePayResultType,
-  j2s,
-} from "@gnu-taler/taler-util";
 
 /**
  * Run a test for the following scenario:
diff --git a/packages/taler-harness/src/integrationtests/test-payment-fault.ts b/packages/taler-harness/src/integrationtests/test-payment-fault.ts
index 5d0fe6e13..70fa587e7 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-fault.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-fault.ts
@@ -21,28 +21,27 @@
 /**
  * Imports.
  */
+import { CoreApiResponse, MerchantApiClient } from "@gnu-taler/taler-util";
 import {
-  GlobalTestState,
-  MerchantService,
-  ExchangeService,
-  setupDb,
-  BankService,
-  WalletCli,
-  getPayto,
-  MerchantApiClient,
-} from "../harness/harness.js";
+  BankAccessApi,
+  BankApi,
+  WalletApiOperation,
+} from "@gnu-taler/taler-wallet-core";
+import { defaultCoinConfig } from "../harness/denomStructures.js";
 import {
   FaultInjectedExchangeService,
   FaultInjectionRequestContext,
   FaultInjectionResponseContext,
 } from "../harness/faultInjection.js";
-import { CoreApiResponse } from "@gnu-taler/taler-util";
-import { defaultCoinConfig } from "../harness/denomStructures.js";
 import {
-  WalletApiOperation,
-  BankApi,
-  BankAccessApi,
-} from "@gnu-taler/taler-wallet-core";
+  BankService,
+  ExchangeService,
+  GlobalTestState,
+  MerchantService,
+  WalletCli,
+  getPayto,
+  setupDb,
+} from "../harness/harness.js";
 
 /**
  * Run test for basic, bank-integrated withdrawal.
diff --git a/packages/taler-harness/src/integrationtests/test-payment-idempotency.ts b/packages/taler-harness/src/integrationtests/test-payment-idempotency.ts
index e06ef1322..65fd3a562 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-idempotency.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-idempotency.ts
@@ -17,9 +17,9 @@
 /**
  * Imports.
  */
-import { PreparePayResultType } from "@gnu-taler/taler-util";
+import { MerchantApiClient, PreparePayResultType } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-payment-multiple.ts b/packages/taler-harness/src/integrationtests/test-payment-multiple.ts
index b22bba43f..23972ed63 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-multiple.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-multiple.ts
@@ -17,17 +17,17 @@
 /**
  * Imports.
  */
+import { MerchantApiClient } from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { coin_ct10, coin_u1 } from "../harness/denomStructures.js";
 import {
-  GlobalTestState,
-  setupDb,
   BankService,
   ExchangeService,
+  GlobalTestState,
   MerchantService,
   getPayto,
-  MerchantApiClient,
+  setupDb,
 } from "../harness/harness.js";
-import { coin_ct10, coin_u1 } from "../harness/denomStructures.js";
-import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import {
   createWalletDaemonWithClient,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-payment-share.ts b/packages/taler-harness/src/integrationtests/test-payment-share.ts
index c12140d06..c4a82c917 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-share.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-share.ts
@@ -19,10 +19,11 @@
  */
 import {
   ConfirmPayResultType,
+  MerchantApiClient,
   PreparePayResultType,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   createWalletDaemonWithClient,
diff --git a/packages/taler-harness/src/integrationtests/test-payment-template.ts b/packages/taler-harness/src/integrationtests/test-payment-template.ts
index 2058991d0..e77236a9a 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-template.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-template.ts
@@ -20,10 +20,11 @@
 import {
   ConfirmPayResultType,
   Duration,
+  MerchantApiClient,
   PreparePayResultType,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-payment-transient.ts b/packages/taler-harness/src/integrationtests/test-payment-transient.ts
index 3bc59aa8f..46e57735f 100644
--- a/packages/taler-harness/src/integrationtests/test-payment-transient.ts
+++ b/packages/taler-harness/src/integrationtests/test-payment-transient.ts
@@ -19,6 +19,7 @@
  */
 import {
   ConfirmPayResultType,
+  MerchantApiClient,
   PreparePayResultType,
   TalerErrorCode,
   TalerErrorDetail,
@@ -27,11 +28,7 @@ import {
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 import { FaultInjectionResponseContext } from "../harness/faultInjection.js";
-import {
-  GlobalTestState,
-  MerchantApiClient,
-  harnessHttpLib,
-} from "../harness/harness.js";
+import { GlobalTestState, harnessHttpLib } from "../harness/harness.js";
 import {
   createFaultInjectedMerchantTestkudosEnvironment,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-paywall-flow.ts b/packages/taler-harness/src/integrationtests/test-paywall-flow.ts
index fd13f37d6..247ec9cad 100644
--- a/packages/taler-harness/src/integrationtests/test-paywall-flow.ts
+++ b/packages/taler-harness/src/integrationtests/test-paywall-flow.ts
@@ -18,17 +18,14 @@
  * Imports.
  */
 import {
-  GlobalTestState,
-  MerchantApiClient,
-  harnessHttpLib,
-} from "../harness/harness.js";
-import {
-  PreparePayResultType,
-  codecForMerchantOrderStatusUnpaid,
   ConfirmPayResultType,
+  MerchantApiClient,
+  PreparePayResultType,
   URL,
+  codecForMerchantOrderStatusUnpaid,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { GlobalTestState, harnessHttpLib } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-refund-auto.ts b/packages/taler-harness/src/integrationtests/test-refund-auto.ts
index 9e1f31af2..e8bfecefa 100644
--- a/packages/taler-harness/src/integrationtests/test-refund-auto.ts
+++ b/packages/taler-harness/src/integrationtests/test-refund-auto.ts
@@ -17,9 +17,13 @@
 /**
  * Imports.
  */
-import { Duration, durationFromSpec } from "@gnu-taler/taler-util";
+import {
+  Duration,
+  MerchantApiClient,
+  durationFromSpec,
+} from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-refund-gone.ts b/packages/taler-harness/src/integrationtests/test-refund-gone.ts
index 954262826..9ba078a6d 100644
--- a/packages/taler-harness/src/integrationtests/test-refund-gone.ts
+++ b/packages/taler-harness/src/integrationtests/test-refund-gone.ts
@@ -17,18 +17,19 @@
 /**
  * Imports.
  */
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import {
+  AbsoluteTime,
+  Duration,
+  MerchantApiClient,
+  durationFromSpec,
+} from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   applyTimeTravelV2,
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
 } from "../harness/helpers.js";
-import {
-  AbsoluteTime,
-  Duration,
-  durationFromSpec,
-} from "@gnu-taler/taler-util";
-import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 
 /**
  * Run test for basic, bank-integrated withdrawal.
diff --git a/packages/taler-harness/src/integrationtests/test-refund-incremental.ts b/packages/taler-harness/src/integrationtests/test-refund-incremental.ts
index 7c895ad2b..e7e041ce6 100644
--- a/packages/taler-harness/src/integrationtests/test-refund-incremental.ts
+++ b/packages/taler-harness/src/integrationtests/test-refund-incremental.ts
@@ -20,15 +20,12 @@
 import {
   Amounts,
   Duration,
+  MerchantApiClient,
   TransactionType,
   durationFromSpec,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import {
-  GlobalTestState,
-  MerchantApiClient,
-  delayMs,
-} from "../harness/harness.js";
+import { GlobalTestState, delayMs } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-refund.ts b/packages/taler-harness/src/integrationtests/test-refund.ts
index 3dc2748fe..aeeb91f38 100644
--- a/packages/taler-harness/src/integrationtests/test-refund.ts
+++ b/packages/taler-harness/src/integrationtests/test-refund.ts
@@ -20,11 +20,12 @@
 import {
   Duration,
   durationFromSpec,
+  MerchantApiClient,
   NotificationType,
   TransactionMajorState,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-harness/src/integrationtests/test-timetravel-autorefresh.ts b/packages/taler-harness/src/integrationtests/test-timetravel-autorefresh.ts
index 420e4fddc..b94f7757c 100644
--- a/packages/taler-harness/src/integrationtests/test-timetravel-autorefresh.ts
+++ b/packages/taler-harness/src/integrationtests/test-timetravel-autorefresh.ts
@@ -21,6 +21,7 @@ import {
   ConfirmPayResultType,
   Duration,
   durationFromSpec,
+  MerchantApiClient,
   PreparePayResultType,
 } from "@gnu-taler/taler-util";
 import {
@@ -31,11 +32,10 @@ import { makeNoFeeCoinConfig } from "../harness/denomStructures.js";
 import {
   BankService,
   ExchangeService,
+  getPayto,
   GlobalTestState,
   MerchantService,
   setupDb,
-  getPayto,
-  MerchantApiClient,
 } from "../harness/harness.js";
 import {
   applyTimeTravelV2,
diff --git a/packages/taler-harness/src/integrationtests/test-tipping.ts b/packages/taler-harness/src/integrationtests/test-tipping.ts
index 93855f546..f4a7c020e 100644
--- a/packages/taler-harness/src/integrationtests/test-tipping.ts
+++ b/packages/taler-harness/src/integrationtests/test-tipping.ts
@@ -17,18 +17,17 @@
 /**
  * Imports.
  */
+import {
+  MerchantApiClient,
+  TransactionMajorState,
+} from "@gnu-taler/taler-util";
 import {
   BankAccessApiClient,
   WalletApiOperation,
   WireGatewayApiClient,
 } from "@gnu-taler/taler-wallet-core";
-import {
-  GlobalTestState,
-  MerchantApiClient,
-  getWireMethodForTest,
-} from "../harness/harness.js";
+import { GlobalTestState, getWireMethodForTest } from "../harness/harness.js";
 import { createSimpleTestkudosEnvironmentV2 } from "../harness/helpers.js";
-import { TransactionMajorState } from "@gnu-taler/taler-util";
 
 /**
  * Run test for basic, bank-integrated withdrawal.
diff --git a/packages/taler-harness/src/integrationtests/test-wallet-backup-doublespend.ts b/packages/taler-harness/src/integrationtests/test-wallet-backup-doublespend.ts
index 62ae89137..c761c4fb0 100644
--- a/packages/taler-harness/src/integrationtests/test-wallet-backup-doublespend.ts
+++ b/packages/taler-harness/src/integrationtests/test-wallet-backup-doublespend.ts
@@ -17,9 +17,9 @@
 /**
  * Imports.
  */
-import { PreparePayResultType } from "@gnu-taler/taler-util";
+import { MerchantApiClient, PreparePayResultType } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   createWalletDaemonWithClient,
@@ -126,11 +126,9 @@ export async function runWalletBackupDoublespendTest(t: GlobalTestState) {
       },
     });
 
-    let orderStatus = await merchantClient.queryPrivateOrderStatus(
-      {
-        orderId: orderResp.order_id,
-      },
-    );
+    let orderStatus = await merchantClient.queryPrivateOrderStatus({
+      orderId: orderResp.order_id,
+    });
 
     t.assertTrue(orderStatus.order_status === "unpaid");
 
diff --git a/packages/taler-harness/src/integrationtests/test-wallet-balance.ts b/packages/taler-harness/src/integrationtests/test-wallet-balance.ts
index 9711aff26..243c90e2e 100644
--- a/packages/taler-harness/src/integrationtests/test-wallet-balance.ts
+++ b/packages/taler-harness/src/integrationtests/test-wallet-balance.ts
@@ -17,9 +17,13 @@
 /**
  * Imports.
  */
-import { Amounts, PreparePayResultType } from "@gnu-taler/taler-util";
+import {
+  Amounts,
+  MerchantApiClient,
+  PreparePayResultType,
+} from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { GlobalTestState, MerchantApiClient } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
   createSimpleTestkudosEnvironmentV2,
   withdrawViaBankV2,
diff --git a/packages/taler-util/src/index.ts b/packages/taler-util/src/index.ts
index cfd0f7c47..0b75619ab 100644
--- a/packages/taler-util/src/index.ts
+++ b/packages/taler-util/src/index.ts
@@ -39,3 +39,5 @@ export * from "./merchant-api-types.js";
 export * from "./errors.js";
 export * from "./iban.js";
 export * from "./transaction-test-data.js";
+export * from "./libeufin-api-types.js";
+export * from "./MerchantApiClient.js";
diff --git a/packages/taler-util/src/merchant-api-types.ts b/packages/taler-util/src/merchant-api-types.ts
index ce30aa054..9933b93dc 100644
--- a/packages/taler-util/src/merchant-api-types.ts
+++ b/packages/taler-util/src/merchant-api-types.ts
@@ -47,7 +47,7 @@ import {
   WireAccount,
   codecForWireAccount,
   codecForList,
-  HashCodeString,
+  FacadeCredentials,
 } from "@gnu-taler/taler-util";
 
 export interface MerchantPostOrderRequest {
@@ -401,21 +401,3 @@ export interface AccountAddDetails {
   // To really delete credentials, set them to the type: "none".
   credit_facade_credentials?: FacadeCredentials;
 }
-
-export type FacadeCredentials =
-  | NoFacadeCredentials
-  | BasicAuthFacadeCredentials;
-
-export interface NoFacadeCredentials {
-  type: "none";
-}
-
-export interface BasicAuthFacadeCredentials {
-  type: "basic";
-
-  // Username to use to authenticate
-  username: string;
-
-  // Password to use to authenticate
-  password: string;
-}