diff --git a/custom_components/supernotify/const.py b/custom_components/supernotify/const.py
index e953da34..2ae6801a 100644
--- a/custom_components/supernotify/const.py
+++ b/custom_components/supernotify/const.py
@@ -83,6 +83,7 @@
 ATTR_SCENARIOS_REQUIRE = "require_scenarios"
 ATTR_SCENARIOS_APPLY = "apply_scenarios"
 ATTR_FORCE_RESEND: Final[str] = "force_resend"
+ATTR_CHANNEL_MESSAGE: Final[str] = "channel_message"
 ATTR_SCENARIOS_CONSTRAIN = "constrain_scenarios"
 ATTR_DELIVERY = "delivery"
 ATTR_DEFAULT = "default"
diff --git a/custom_components/supernotify/notification.py b/custom_components/supernotify/notification.py
index 6c614256..2e3a4993 100644
--- a/custom_components/supernotify/notification.py
+++ b/custom_components/supernotify/notification.py
@@ -15,6 +15,7 @@
 from .const import (
     ATTR_ACTION_GROUPS,
     ATTR_ACTIONS,
+    ATTR_CHANNEL_MESSAGE,
     ATTR_DEBUG,
     ATTR_DELIVERY,
     ATTR_DELIVERY_SELECTION,
@@ -71,7 +72,7 @@
 KEY_SKIPPED = "skipped"
 
 # supernotify specific data items not to be passed to transports in data
-INTERNAL_DATA_KEYS = (ATTR_FORCE_RESEND, ATTR_SPOKEN_MESSAGE)
+INTERNAL_DATA_KEYS = (ATTR_FORCE_RESEND, ATTR_SPOKEN_MESSAGE, ATTR_CHANNEL_MESSAGE)
 
 type t_delivery_name = str
 type t_outcome = str
@@ -600,12 +601,8 @@ def base_filename(self) -> str:
         """ArchiveableObject implementation"""
         return f"{self.created.isoformat()[:16].replace(':', '-')}_{self.id}"
 
-    def delivery_data(self, delivery: Delivery) -> dict[str, Any]:
-        if delivery is None:
-            return {}
-        delivery_override: DeliveryCustomization | None = self.delivery_overrides.get(delivery.name)
-        if delivery_override is None:
-            delivery_override = self.delivery_overrides.get(delivery.transport.name)
+    def delivery_data(self, delivery_name: str) -> dict[str, Any]:
+        delivery_override: DeliveryCustomization | None = self.delivery_overrides.get(delivery_name)
         return delivery_override.data if delivery_override and delivery_override.data else {}
 
     @property
@@ -792,16 +789,17 @@ def generate_envelopes(self, delivery: Delivery, targets: list[Target]) -> list[
             if target.has_resolved_target() or delivery.target_required != TargetRequired.ALWAYS:
                 envelope_data = {}
                 envelope_data.update(delivery.data)
-                envelope_data.update({
-                    k: v for k, v in self.extra_data.items() if k not in INTERNAL_DATA_KEYS
-                })  # action call data
-                if target.target_data:
-                    envelope_data.update(target.target_data)
                 # scenario applied at cross-delivery level in apply_enabled_scenarios
                 for scenario in self.enabled_scenarios.values():
                     customization: DeliveryCustomization | None = scenario.delivery_customization(delivery.name)
                     if customization and customization.data:
                         envelope_data.update(customization.data)
+                # action call data overrides scenario data
+                envelope_data.update({
+                    k: v for k, v in self.extra_data.items() if k not in INTERNAL_DATA_KEYS
+                })  # action call data
+                if target.target_data:
+                    envelope_data.update(target.target_data)
                 envelopes.append(Envelope(delivery, self, target, envelope_data, context=self.context))
 
         return envelopes