fix: turn customer into email

bd_api/apps/payment/webhooks.py

@@ -106,7 +106,7 @@ def subscribe(event: Event, **kwargs):
     """Add customer to allowed google groups"""
     if event.data["object"]["status"] in ["trialing", "active"]:
         if subscription := get_subscription(event):
-            add_user(event.customer.customer)
+            add_user(event.customer.email)
             subscription.is_active = True
             subscription.save()