diff --git a/backend/magic_plan/magic_plan_client.py b/backend/magic_plan/magic_plan_client.py
index 06905e6a..4029c436 100644
--- a/backend/magic_plan/magic_plan_client.py
+++ b/backend/magic_plan/magic_plan_client.py
@@ -9,7 +9,7 @@ class MagicPlanClient:
     def __init__(self, customer_id: str, api_key: str) -> None:
         self._api_key = api_key
         self._session = requests.Session()
-        self._session.headers.update({"customer": customer_id})
+        self._session.headers.update({"customer": customer_id, "key": api_key})
 
     def get_plans(self) -> PlansListResponse:
         r = self._session.get(f"{_BASE_URL}/plans", params={"key": self._api_key})