diff --git a/bp/cart/services/checkout.py b/bp/cart/services/checkout.py
index 85c7cc1..ef2843b 100644
--- a/bp/cart/services/checkout.py
+++ b/bp/cart/services/checkout.py
@@ -9,10 +9,10 @@ from sqlalchemy.orm import selectinload
 
 from shared.models.market import Product, CartItem
 from shared.models.order import Order, OrderItem
-from shared.models.calendars import Calendar
 from shared.models.page_config import PageConfig
 from shared.models.market_place import MarketPlace
 from shared.config import config
+from shared.contracts.dtos import CalendarEntryDTO
 from shared.events import emit_event
 from shared.services.registry import services
 
@@ -64,7 +64,7 @@ async def find_or_create_cart_item(
 async def resolve_page_config(
     session: AsyncSession,
     cart: list[CartItem],
-    calendar_entries: list[CalendarEntry],
+    calendar_entries: list[CalendarEntryDTO],
 ) -> Optional["PageConfig"]:
     """Determine the PageConfig for this order.
 
@@ -82,9 +82,8 @@ async def resolve_page_config(
 
     # From calendar entries via calendar
     for entry in calendar_entries:
-        cal = await session.get(Calendar, entry.calendar_id)
-        if cal and cal.container_id:
-            post_ids.add(cal.container_id)
+        if entry.calendar_container_id:
+            post_ids.add(entry.calendar_container_id)
 
     if len(post_ids) > 1:
         raise ValueError("Cannot checkout items from multiple pages")
@@ -105,7 +104,7 @@ async def resolve_page_config(
 async def create_order_from_cart(
     session: AsyncSession,
     cart: list[CartItem],
-    calendar_entries: list[CalendarEntry],
+    calendar_entries: list[CalendarEntryDTO],
     user_id: Optional[int],
     session_id: Optional[str],
     product_total: float,
diff --git a/shared b/shared
index 9cba422..b3a0e99 160000
--- a/shared
+++ b/shared
@@ -1 +1 @@
-Subproject commit 9cba422aa9c072db4bbb2662315d66ea011bd19e
+Subproject commit b3a0e9922ac403caf54805b13fff652503b5d07d