diff --git a/modules/routes/routeBilling.py b/modules/routes/routeBilling.py
index 058038c0..d193f9bb 100644
--- a/modules/routes/routeBilling.py
+++ b/modules/routes/routeBilling.py
@@ -332,7 +332,7 @@ def _getStripeClient():
 
 def _creditStripeSessionIfNeeded(billingInterface, session: Dict[str, Any], eventId: Optional[str] = None) -> CheckoutConfirmResponse:
     """Credit balance from Stripe Checkout session if not already credited."""
-    from .billingWebhookHandler import creditStripeSessionIfNeeded
+    from modules.serviceCenter.services.serviceBilling.billingWebhookHandler import creditStripeSessionIfNeeded
     return creditStripeSessionIfNeeded(billingInterface, session, eventId, CheckoutConfirmResponse)
 
 
@@ -1079,13 +1079,13 @@ async def stripeWebhook(
 
 def handleSubscriptionCheckoutCompleted(session, eventId: str) -> None:
     """Handle checkout.session.completed for mode=subscription."""
-    from .billingWebhookHandler import handleSubscriptionCheckoutCompleted as _handler
+    from modules.serviceCenter.services.serviceBilling.billingWebhookHandler import handleSubscriptionCheckoutCompleted as _handler
     _handler(session, eventId, getRootInterface)
 
 
 def _handleSubscriptionWebhook(event) -> None:
     """Process Stripe subscription webhook events."""
-    from .billingWebhookHandler import handleSubscriptionWebhook as _handler
+    from modules.serviceCenter.services.serviceBilling.billingWebhookHandler import handleSubscriptionWebhook as _handler
     _handler(event, getRootInterface)
 
 
diff --git a/modules/routes/billingWebhookHandler.py b/modules/serviceCenter/services/serviceBilling/billingWebhookHandler.py
similarity index 99%
rename from modules/routes/billingWebhookHandler.py
rename to modules/serviceCenter/services/serviceBilling/billingWebhookHandler.py
index ecfe37b4..8e765cc7 100644
--- a/modules/routes/billingWebhookHandler.py
+++ b/modules/serviceCenter/services/serviceBilling/billingWebhookHandler.py
@@ -2,7 +2,7 @@
 # All rights reserved.
 """
 Stripe webhook and subscription business logic for billing.
-Extracted from routeBilling.py for maintainability.
+Handles checkout credit, subscription lifecycle transitions, and invoice events.
 """
 
 import logging