diff --git a/cmd/cart/pool-server.go b/cmd/cart/pool-server.go
index 53ea7c0..116aea3 100644
--- a/cmd/cart/pool-server.go
+++ b/cmd/cart/pool-server.go
@@ -58,8 +58,8 @@ func NewPoolServer(pool actor.GrainPool[*cart.CartGrain], pod_name string, klarn
 	inventory.NewInventoryChangeListener(inventoryRedisClient, context.Background(), func(changes []inventory.InventoryChange) {
 		for _, change := range changes {
 			srv.GrainPool.GetPubSub().Publish(actor.Event{
-				Topic:   fmt.Sprintf("inventory:%s:%s", change.SKU, change.StockLocationID),
-				Payload: change.Value,
+				Topic:   fmt.Sprintf("inventory:%s", change.SKU),
+				Payload: change,
 			})
 		}
 	})
diff --git a/pkg/cart/cart-grain.go b/pkg/cart/cart-grain.go
index 7f3d96e..eb671fe 100644
--- a/pkg/cart/cart-grain.go
+++ b/pkg/cart/cart-grain.go
@@ -11,6 +11,7 @@ import (
 	"git.k6n.net/go-cart-actor/pkg/actor"
 	messages "git.k6n.net/go-cart-actor/pkg/messages"
 	"git.k6n.net/go-cart-actor/pkg/voucher"
+	"github.com/matst80/go-redis-inventory/pkg/inventory"
 )
 
 // Legacy padded [16]byte CartId and its helper methods removed.
@@ -235,26 +236,23 @@ func (c *CartGrain) Notify(event actor.Event) {
 	defer c.mu.Unlock()
 	// Example: if event is inventory change for a SKU in the cart
 	if strings.HasPrefix(event.Topic, "inventory:") {
-		skuAndLocationId := strings.TrimPrefix(event.Topic, "inventory:")
-		parts := strings.Split(skuAndLocationId, ":")
-		if len(parts) != 2 {
+		sku := strings.TrimPrefix(event.Topic, "inventory:")
+
+		log.Printf("cart grain got inventory update: %s", event.Topic)
+		update, ok := event.Payload.(inventory.InventoryChange)
+		if !ok {
+			log.Printf("cart grain inventory update has invalid payload")
 			return
 		}
-		sku := parts[0]
-		locationId := parts[1]
-		log.Printf("cart grain got inventory update: %s", event.Topic)
 		for _, item := range c.Items {
-			if item.Sku == sku && item.StoreId != nil && *item.StoreId == locationId {
+
+			if item.Sku == sku && update.StockLocationID == *item.StoreId {
 				// Update stock status based on payload, e.g., if payload is bool available
 
-				if quantity, ok := event.Payload.(int64); ok {
-					log.Printf("cart grain got item stock update %d", quantity)
-					if quantity > 0 {
-						item.Stock = 1 // assuming 1 is in stock
-					} else {
-						item.Stock = 0 // out of stock
-					}
-				}
+				log.Printf("cart grain got item stock update %d", update.Value)
+
+				item.Stock = uint16(update.Value)
+
 				break
 			}
 		}