diff --git a/ecommerce_integrations/unicommerce/api_client.py b/ecommerce_integrations/unicommerce/api_client.py
index 8bb5336e..dcedac38 100644
--- a/ecommerce_integrations/unicommerce/api_client.py
+++ b/ecommerce_integrations/unicommerce/api_client.py
@@ -92,14 +92,17 @@ def get_unicommerce_item(self, sku: str) -> Optional[JsonDict]:
 		if status:
 			return item
 
-	def create_update_item(self, item_dict: JsonDict) -> Tuple[JsonDict, bool]:
+	def create_update_item(self, item_dict: JsonDict, update=False) -> Tuple[JsonDict, bool]:
 		"""Create/update item on unicommerce.
 
 		ref: https://documentation.unicommerce.com/docs/createoredit-itemtype.html
 		"""
-		return self.request(
-			endpoint="/services/rest/v1/catalog/itemType/createOrEdit", body={"itemType": item_dict}
-		)
+
+		endpoint = "/services/rest/v1/catalog/itemType/createOrEdit"
+		if update:
+			# Edit has separate endpoint even though docs suggest otherwise
+			endpoint = "/services/rest/v1/catalog/itemType/edit"
+		return self.request(endpoint=endpoint, body={"itemType": item_dict})
 
 	def get_sales_order(self, order_code: str) -> Optional[JsonDict]:
 		"""Get details for a sales order.
diff --git a/ecommerce_integrations/unicommerce/product.py b/ecommerce_integrations/unicommerce/product.py
index f33ae37f..ea61d98a 100644
--- a/ecommerce_integrations/unicommerce/product.py
+++ b/ecommerce_integrations/unicommerce/product.py
@@ -245,7 +245,10 @@ def upload_items_to_unicommerce(
 
 	for item_code in item_codes:
 		item_data = _build_unicommerce_item(item_code)
-		_, status = client.create_update_item(item_data)
+		sku = item_data.get("skuCode")
+
+		item_exists = bool(client.get_unicommerce_item(sku))
+		_, status = client.create_update_item(item_data, update=item_exists)
 
 		if status:
 			_handle_ecommerce_item(item_code)
@@ -268,6 +271,9 @@ def _build_unicommerce_item(item_code: ItemCode) -> JsonDict:
 	item_json["enabled"] = not bool(item.get("disabled"))
 
 	for barcode in item.barcodes:
+		if not item_json.get("scanIdentifier"):
+			# Set first barcode as scan identifier
+			item_json["scanIdentifier"] = barcode.barcode
 		if barcode.barcode_type == "EAN":
 			item_json["ean"] = barcode.barcode
 		elif barcode.barcode_type == "UPC-A":
diff --git a/ecommerce_integrations/unicommerce/tests/fixtures/simple_item.json b/ecommerce_integrations/unicommerce/tests/fixtures/simple_item.json
index 472ce91a..74e33ca6 100644
--- a/ecommerce_integrations/unicommerce/tests/fixtures/simple_item.json
+++ b/ecommerce_integrations/unicommerce/tests/fixtures/simple_item.json
@@ -10,7 +10,7 @@
 		"categoryCode": "Products",
 		"name": "TITANIUM WATCH",
 		"description": "This is a watch.",
-		"scanIdentifier": "TITANIUM_WATCH",
+		"scanIdentifier": "73513537",
 		"length": 100,
 		"width": 100,
 		"height": 50,