diff --git a/build-system/taler-build-scripts b/build-system/taler-build-scripts
index 38c168b11..c76fb9b3a 160000
--- a/build-system/taler-build-scripts
+++ b/build-system/taler-build-scripts
@@ -1 +1 @@
-Subproject commit 38c168b11eeeab93562ffa74b3e2aff4b596c77a
+Subproject commit c76fb9b3af6ec43f2d2a83e6b4f523dcc5ac6a54
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts
index 2fbc952e7..d51694026 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts
@@ -88,20 +88,17 @@ export async function runLibeufinApiBankaccountTest(t: GlobalTestState) {
     "mock",
     "local-mock",
   );
-
-  await LibeufinSandboxApi.bookPayment2(sandbox, {
-    creditorIban: "DE71500105179674997361",
-    creditorBic: "BELADEBEXXX",
-    creditorName: "mock",
-    debtorIban: "DE84500105176881385584",
-    debtorBic: "BELADEBEXXX",
-    debtorName: "mock2",
-    subject: "mock subject",
-    currency: "EUR",
-    amount: "1",
-    uid: "mock",
-    direction: "CRDT",
-  });
+  await LibeufinSandboxApi.simulateIncomingTransaction(
+    sandbox,
+    "mock", // creditor bankaccount label
+    {
+      debtorIban: "DE84500105176881385584",
+      debtorBic: "BELADEBEXXX",
+      debtorName: "mock2",
+      amount: "1",
+      subject: "mock subject",
+    }
+  );
   await LibeufinNexusApi.fetchAllTransactions(nexus, "local-mock");
   let transactions = await LibeufinNexusApi.getAccountTransactions(
     nexus,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts
index fc558af14..f9676c58c 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts
@@ -42,32 +42,30 @@ export async function runLibeufinApiSandboxTransactionsTest(t: GlobalTestState)
     label: "mock-account",
     currency: "EUR"
   });
-  await LibeufinSandboxApi.bookPayment2(sandbox, {
-    creditorIban: "DE71500105179674997361",
-    creditorBic: "BELADEBEXXX",
-    creditorName: "mock",
-    debtorIban: "DE84500105176881385584",
-    debtorBic: "BELADEBEXXX",
-    debtorName: "mock2",
-    subject: "mock subject",
-    currency: "EUR",
-    amount: "1",
-    uid: "mock",
-    direction: "CRDT",
-  });
-  await LibeufinSandboxApi.bookPayment2(sandbox, {
-    creditorIban: "DE71500105179674997361",
-    creditorBic: "BELADEBEXXX",
-    creditorName: "mock",
-    debtorIban: "DE84500105176881385584",
-    debtorBic: "BELADEBEXXX",
-    debtorName: "mock2",
-    subject: "mock subject 2",
-    currency: "EUR",
-    amount: "1.1",
-    uid: "mock2",
-    direction: "CRDT",
-  });
+  await LibeufinSandboxApi.simulateIncomingTransaction(
+    sandbox, 
+    "mock-account",
+    {
+    
+      debtorIban: "DE84500105176881385584",
+      debtorBic: "BELADEBEXXX",
+      debtorName: "mock2",
+      subject: "mock subject",
+      amount: "1" // EUR is default.
+    }
+  )
+  await LibeufinSandboxApi.simulateIncomingTransaction(
+    sandbox, 
+    "mock-account",
+    {
+    
+      debtorIban: "DE84500105176881385584",
+      debtorBic: "BELADEBEXXX",
+      debtorName: "mock2",
+      subject: "mock subject 2",
+      amount: "1.1" // EUR is default.
+    }
+  )
   let ret = await LibeufinSandboxApi.getAccountInfoWithBalance(sandbox, "mock-account");
   t.assertAmountEquals(ret.data.balance, "EUR:2.1");
 }
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts
index 843a35d88..cd488fcf5 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts
@@ -63,43 +63,29 @@ export async function runLibeufinRefundTest(t: GlobalTestState) {
    * user01 checks whether one incoming payment exists in the
    * history.  This one incoming payment will be the refund.
    */
-  await LibeufinSandboxApi.bookPayment(
-    libeufinServices.libeufinSandbox,
-    user02sandbox,
-    user01sandbox,
+  await libeufinServices.libeufinSandbox.makeTransaction(
+    user02sandbox.ebicsBankAccount.label, // debit
+    user01sandbox.ebicsBankAccount.label, // credit
+    "EUR:1",
     "not a public key",
-    "1",
-    "EUR",
   );
 
-  // check payment shows up in the Sandbox' history.
-  // NOTE: the debitor account has no entry so far, because
-  // the call above is a mere test method that books only one
-  // CRDT transaction.
-  const txsCredit = await LibeufinSandboxApi.getAccountTransactions(
-    libeufinServices.libeufinSandbox,
-    user02sandbox.ebicsBankAccount["label"]);
-  t.assertTrue(txsCredit["payments"].length == 1);
-
   // Gets the faulty payment in the (ingested) history.
   await LibeufinNexusApi.fetchAllTransactions(
     libeufinServices.libeufinNexus,
-    user02nexus.localAccountName,
+    user01nexus.localAccountName,
   );
-  // Give time to ingest.
-  delayMs(2000);
-
   // Check payment shows up in Nexus history.
   const nexusTxs = await LibeufinNexusApi.getAccountTransactions(
     libeufinServices.libeufinNexus,
-    user02nexus.localAccountName,
+    user01nexus.localAccountName,
   );
   t.assertTrue(nexusTxs.data["transactions"].length == 1);
 
   // This should pay the faulty payment back.
   await LibeufinNexusApi.submitInitiatedPayment(
     libeufinServices.libeufinNexus,
-    user02nexus.localAccountName,
+    user01nexus.localAccountName,
     // The initiated payment ID below got set by the Taler
     // facade; at this point only one can / must exist.
     "1",
@@ -108,8 +94,10 @@ export async function runLibeufinRefundTest(t: GlobalTestState) {
   // Counterpart checks whether the reimbursement shows up.
   let history = await LibeufinSandboxApi.getAccountTransactions(
     libeufinServices.libeufinSandbox,
-    user01sandbox.ebicsBankAccount["label"],
+    user02sandbox.ebicsBankAccount["label"],
   );
-  t.assertTrue(history["payments"].length == 1);
+
+  // 2 is total: 1 the original payment + 1 the reimbursement.
+  t.assertTrue(history["payments"].length == 2);
 }
 runLibeufinRefundTest.suites = ["libeufin"];
diff --git a/packages/taler-wallet-cli/src/integrationtests/testrunner.ts b/packages/taler-wallet-cli/src/integrationtests/testrunner.ts
index 32d369fc1..71f92095a 100644
--- a/packages/taler-wallet-cli/src/integrationtests/testrunner.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/testrunner.ts
@@ -71,7 +71,6 @@ import { runLibeufinApiUsersTest } from "./test-libeufin-api-users";
 import { runLibeufinApiBankaccountTest } from "./test-libeufin-api-bankaccount";
 import { runLibeufinApiSandboxTransactionsTest } from "./test-libeufin-api-sandbox-transactions";
 import { runLibeufinApiSandboxCamtTest } from "./test-libeufin-api-sandbox-camt";
-import { runLibeufinSandboxCamtStatementTest } from "./test-libeufin-sandbox-camt-statement";
 import { runLibeufinSandboxWireTransferCliTest } from "./test-libeufin-sandbox-wire-transfer-cli";
 import { runDepositTest } from "./test-deposit";
 import CancellationToken from "cancellationtoken";
@@ -123,7 +122,6 @@ const allTests: TestMainFunction[] = [
   runLibeufinApiBankconnectionTest,
   runLibeufinApiSandboxTransactionsTest,
   runLibeufinApiSandboxCamtTest,
-  runLibeufinSandboxCamtStatementTest,
   runLibeufinSandboxWireTransferCliTest,
   runMerchantExchangeConfusionTest,
   runMerchantInstancesTest,