diff --git a/docs/hub/_index.md b/docs/hub/_index.md
index 35d63e0..0a367e9 100644
--- a/docs/hub/_index.md
+++ b/docs/hub/_index.md
@@ -9,7 +9,6 @@
 | [`echo`](./echo.md) | 1 |
 | [`email`](./email.md) | 1 |
 | [`files`](./files.md) | 23 |
-| [`internal`](./internal.md) | 1 |
 | [`logs`](./logs.md) | 15 |
 | [`membership`](./membership.md) | 25 |
 | [`notifications`](./notifications.md) | 117 |
diff --git a/docs/hub/internal.md b/docs/hub/internal.md
deleted file mode 100644
index 87fe897..0000000
--- a/docs/hub/internal.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# HUB · Internal
-
-Access with `norbix.hub.internal`.
-
-| Method | Verb | Path | Scope |
-| --- | --- | --- | --- |
-| `internals_type_gen` | `GET` | `/internal/_typegen` | `project` |
diff --git a/src/norbix_python/client.py b/src/norbix_python/client.py
index 6014ef0..2d994fb 100644
--- a/src/norbix_python/client.py
+++ b/src/norbix_python/client.py
@@ -324,7 +324,6 @@ def __init__(
         self.email = hub.email
         self.environments = hub.environments
         self.files = hub.files
-        self.internal = hub.internal
         self.logs = hub.logs
         self.membership = hub.membership
         self.notifications = hub.notifications
@@ -341,7 +340,6 @@ def __init__(
         self.Email = self.email
         self.Environments = self.environments
         self.Files = self.files
-        self.Internal = self.internal
         self.Logs = self.logs
         self.Membership = self.membership
         self.Notifications = self.notifications
diff --git a/src/norbix_python/hub/__init__.py b/src/norbix_python/hub/__init__.py
index 980c801..974f47a 100644
--- a/src/norbix_python/hub/__init__.py
+++ b/src/norbix_python/hub/__init__.py
@@ -9,7 +9,6 @@
 from .email import AsyncEmailModule, EmailModule
 from .environments import AsyncEnvironmentsModule, EnvironmentsModule
 from .files import AsyncFilesModule, FilesModule
-from .internal import AsyncInternalModule, InternalModule
 from .logs import AsyncLogsModule, LogsModule
 from .membership import AsyncMembershipModule, MembershipModule
 from .notifications import AsyncNotificationsModule, NotificationsModule
@@ -31,7 +30,6 @@ def __init__(self, transport: Transport) -> None:
         self.email = EmailModule(transport)
         self.environments = EnvironmentsModule(transport)
         self.files = FilesModule(transport)
-        self.internal = InternalModule(transport)
         self.logs = LogsModule(transport)
         self.membership = MembershipModule(transport)
         self.notifications = NotificationsModule(transport)
@@ -53,7 +51,6 @@ def __init__(self, transport: AsyncTransport) -> None:
         self.email = AsyncEmailModule(transport)
         self.environments = AsyncEnvironmentsModule(transport)
         self.files = AsyncFilesModule(transport)
-        self.internal = AsyncInternalModule(transport)
         self.logs = AsyncLogsModule(transport)
         self.membership = AsyncMembershipModule(transport)
         self.notifications = AsyncNotificationsModule(transport)
diff --git a/src/norbix_python/hub/internal.py b/src/norbix_python/hub/internal.py
deleted file mode 100644
index a34229f..0000000
--- a/src/norbix_python/hub/internal.py
+++ /dev/null
@@ -1,41 +0,0 @@
-from __future__ import annotations
-
-from typing import Any
-
-from ..transport import AsyncTransport, Transport
-
-
-class InternalModule:
-    def __init__(self, transport: Transport) -> None:
-        self._transport = transport
-
-    def internals_type_gen(self, *, timeout: float | None = None, bearer_token: str | None = None, **request: Any) -> Any:
-        """GET /internal/_typegen"""
-        return self._transport.send(
-            target="hub",
-            path="/internal/_typegen",
-            method="GET",
-            path_params={},
-            request=request,
-            scope="project",
-            timeout=timeout,
-            bearer_token=bearer_token,
-        )
-
-
-class AsyncInternalModule:
-    def __init__(self, transport: AsyncTransport) -> None:
-        self._transport = transport
-
-    async def internals_type_gen(self, *, timeout: float | None = None, bearer_token: str | None = None, **request: Any) -> Any:
-        """GET /internal/_typegen"""
-        return await self._transport.send(
-            target="hub",
-            path="/internal/_typegen",
-            method="GET",
-            path_params={},
-            request=request,
-            scope="project",
-            timeout=timeout,
-            bearer_token=bearer_token,
-        )
diff --git a/tests/hub/test_internal.py b/tests/hub/test_internal.py
deleted file mode 100644
index ba61650..0000000
--- a/tests/hub/test_internal.py
+++ /dev/null
@@ -1,18 +0,0 @@
-from __future__ import annotations
-
-from norbix_python import Norbix, NorbixError
-from ..helpers import make_client
-
-
-def test_hub_internal_module_surface() -> None:
-    client, _ = make_client()
-    module = client.hub.internal
-    assert callable(module.internals_type_gen)
-
-
-def test_hub_internal_internals_type_gen_request_shape() -> None:
-    client, transport = make_client(account_id=None)
-    client.hub.internal.internals_type_gen()
-    assert transport.last_request['method'] == 'GET'
-    assert transport.last_request is not None
-    assert transport.last_request['url'].startswith('https://')
diff --git a/tests/hub/test_payments.py b/tests/hub/test_payments.py
index 5b1b4a8..b4a2d58 100644
--- a/tests/hub/test_payments.py
+++ b/tests/hub/test_payments.py
@@ -131,6 +131,20 @@ def test_hub_payments_save_payments_integration_request_shape() -> None:
     assert transport.last_request is not None
     assert transport.last_request['url'].startswith('https://')
 
+def test_hub_payments_save_montonio_integration_leaves_out_unset_is_sandbox() -> None:
+    # Owner 2026-10-22: isSandbox is optional; empty = true (sandbox) on the gateway.
+    # The SDK must not fill in a default, or an unset field would become live mode.
+    import json
+
+    client, transport = make_client(account_id=None)
+    client.hub.payments.save_payments_integration(
+        integration={"provider": "Montonio", "accessKey": "ak_test", "secretKey": "sk_test"},
+    )
+    assert transport.last_request is not None
+    body = json.loads(transport.last_request['body'])
+    assert body == {"integration": {"provider": "Montonio", "accessKey": "ak_test", "secretKey": "sk_test"}}
+    assert "isSandbox" not in body["integration"]
+
 def test_hub_payments_test_payments_integration_request_shape() -> None:
     client, transport = make_client(account_id=None)
     client.hub.payments.test_payments_integration()