fix(python): update extension checkout imports

rest/python/server/integration_test.py

@@ -45,14 +45,16 @@
 from ucp_sdk.models.schemas.shopping.types import (
   payment_instrument as payment_instr_type,
 )
-from ucp_sdk.models.schemas.shopping.ap2_mandate import Checkout as Ap2Checkout
-from ucp_sdk.models.schemas.shopping.buyer_consent import (
+from ucp_sdk.models.schemas.shopping.ap2_mandate.dev.ucp.shopping import (
+  Checkout as Ap2Checkout,
+)
+from ucp_sdk.models.schemas.shopping.buyer_consent.dev.ucp.shopping import (
   Checkout as BuyerConsentCheckoutResp,
 )
-from ucp_sdk.models.schemas.shopping.discount import (
+from ucp_sdk.models.schemas.shopping.discount.dev.ucp.shopping import (
   Checkout as DiscountCheckoutResp,
 )
-from ucp_sdk.models.schemas.shopping.fulfillment import (
+from ucp_sdk.models.schemas.shopping.fulfillment.dev.ucp.shopping import (
   Checkout as FulfillmentCheckout,
 )
 from ucp_sdk.models.schemas.shopping.order import PlatformSchema

rest/python/server/models.py

@@ -20,17 +20,19 @@
 """
 
 from typing import Any
-from ucp_sdk.models.schemas.shopping.ap2_mandate import Checkout as Ap2Checkout
-from ucp_sdk.models.schemas.shopping.buyer_consent import (
+from ucp_sdk.models.schemas.shopping.ap2_mandate.dev.ucp.shopping import (
+  Checkout as Ap2Checkout,
+)
+from ucp_sdk.models.schemas.shopping.buyer_consent.dev.ucp.shopping import (
   Checkout as BuyerConsentCheckoutResp,
 )
-from ucp_sdk.models.schemas.shopping.discount import (
+from ucp_sdk.models.schemas.shopping.discount import DiscountsObject
+from ucp_sdk.models.schemas.shopping.discount.dev.ucp.shopping import (
   Checkout as DiscountCheckoutResp,
-  DiscountsObject,
 )
-from ucp_sdk.models.schemas.shopping.fulfillment import (
+from ucp_sdk.models.schemas.shopping.fulfillment import Fulfillment
+from ucp_sdk.models.schemas.shopping.fulfillment.dev.ucp.shopping import (
   Checkout as FulfillmentCheckout,
-  Fulfillment,
 )
 
 from ucp_sdk.models.schemas.shopping.order import Order

rest/python/server/server_import_test.py

@@ -0,0 +1,29 @@
+#   Copyright 2026 UCP Authors
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+"""Smoke tests for the sample server module."""
+
+import importlib
+from pathlib import Path
+import sys
+
+
+def test_server_module_imports(monkeypatch) -> None:
+  """The sample server should import with the current Python SDK models."""
+  monkeypatch.syspath_prepend(str(Path(__file__).parent))
+  sys.modules.pop("server", None)
+
+  server = importlib.import_module("server")
+
+  assert server.app is not None