diff --git a/app/main.py b/app/main.py
index 5801d8e..6e5ef7d 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1262,6 +1262,9 @@ async def opencollective_webhook(request: Request, token: str):
         raise HTTPException(401, "Invalid webhook token")
 
     payload = await request.json()
+    # DEBUG (temporary): log the full payload once to learn the real shape of
+    # tier fields on order.processed. Remove after tier routing is verified.
+    logger.info("OC webhook payload: %s", json.dumps(payload)[:1500])
 
     event_type = payload.get("type", "")
     data = payload.get("data", {})