diff --git a/.env b/.env
index c515217..8b4ef54 100644
--- a/.env
+++ b/.env
@@ -66,3 +66,7 @@ NEXT_PUBLIC_MEDUSA_PUBLISHABLE_KEY=
 NEXT_PUBLIC_MONTONIO_ACCESS_KEY=7da5d7fa-3383-4997-9435-46aa818f4ead
 MONTONIO_SECRET_KEY=rNZkzwxOiH93mzkdV53AvhSsbGidrgO2Kl5lE/IT7cvo
 MONTONIO_API_URL=https://sandbox-stargate.montonio.com
+
+# MEDUSA
+MEDUSA_BACKEND_URL=http://localhost:9000
+MEDUSA_BACKEND_PUBLIC_URL=http://localhost:9000
diff --git a/.env.example b/.env.example
index 92af783..ce9f94c 100644
--- a/.env.example
+++ b/.env.example
@@ -2,7 +2,7 @@
 # https://app.supabase.com/project/_/settings/api
 NEXT_PUBLIC_SUPABASE_URL=your-project-url
 NEXT_PUBLIC_SUPABASE_ANON_KEY=your-anon-key
-NEXT_PUBLIC_SUPABASE_SERVICE_ROLE_KEY=your-service-role-key
+SUPABASE_SERVICE_ROLE_KEY=your-service-role-key
 
 MEDIPOST_URL=your-medipost-url
 MEDIPOST_USER=your-medipost-user
diff --git a/lib/services/medusaCart.service.ts b/lib/services/medusaCart.service.ts
index 821076f..3730917 100644
--- a/lib/services/medusaCart.service.ts
+++ b/lib/services/medusaCart.service.ts
@@ -8,14 +8,14 @@ import { StoreCartLineItem, StoreProductVariant } from '@medusajs/types';
 import { MontonioOrderHandlerService } from '@/packages/billing/montonio/src';
 import { requireUserInServerComponent } from '../server/require-user-in-server-component';
 
-const medusaBackendUrl = process.env.MEDUSA_BACKEND_URL!;
+const medusaBackendPublicUrl = process.env.MEDUSA_BACKEND_PUBLIC_URL!;
 const siteUrl = process.env.NEXT_PUBLIC_SITE_URL!;
 
 const env = z
   .object({
-    medusaBackendUrl: z
+    medusaBackendPublicUrl: z
       .string({
-        required_error: 'MEDUSA_BACKEND_URL is required',
+        required_error: 'MEDUSA_BACKEND_PUBLIC_URL is required',
       })
       .min(1),
     siteUrl: z
@@ -25,7 +25,7 @@ const env = z
       .min(1),
   })
   .parse({
-    medusaBackendUrl,
+    medusaBackendPublicUrl,
     siteUrl,
   });
 
@@ -81,7 +81,7 @@ export async function handleNavigateToPayment({ language, paymentSessionId }: {
   }
 
   const paymentLink = await new MontonioOrderHandlerService().getMontonioPaymentLink({
-    notificationUrl: `${env.medusaBackendUrl}/api/billing/webhook`,
+    notificationUrl: `${env.medusaBackendPublicUrl}/hooks/payment/montonio_montonio`,
     returnUrl: `${env.siteUrl}/home/cart/montonio-callback`,
     amount: cart.total,
     currency: cart.currency_code.toUpperCase(),