diff --git a/src/dto/purchase.py b/src/dto/purchase.py
index 420ceba..81ccb59 100644
--- a/src/dto/purchase.py
+++ b/src/dto/purchase.py
@@ -40,6 +40,7 @@ class PlacementOutput(pydantic.BaseModel):
     project: ProjectOutput | None = None
     short_id: str
     details: PlacementDetails | None = None
+    created_at: datetime.datetime
 
 
 class PostOutput(pydantic.BaseModel):
diff --git a/src/usecase/purchase/create_placements.py b/src/usecase/purchase/create_placements.py
index 78fccce..6bdcff9 100644
--- a/src/usecase/purchase/create_placements.py
+++ b/src/usecase/purchase/create_placements.py
@@ -144,6 +144,7 @@ def _build_placement_output(
         creative_name=creative_name,
         comment=placement.comment,
         invite_link=placement.invite_link,
+        invite_link_created_at=placement.invite_link_created_at,
         invite_link_type=placement.invite_link_type,
         channel=dto.ChannelOutput(
             id=channel.id,
@@ -154,6 +155,7 @@ def _build_placement_output(
         project=project_output,
         short_id=short_id,
         details=_build_placement_details(placement),
+        created_at=placement.created_at,
     )