def _create_assets(client, dsa_page_url_label, customer_id):
    """Creates Assets to be used in a DSA page feed.

    Args:
        client: an initialized GoogleAdsClient instance.
        dsa_page_url_label: a label for the DSA page URLs.
        customer_id: a client customer ID.

    Returns:
        a list of asset resource names.
    """
    urls = [
        "http://www.example.com/discounts/rental-cars",
        "http://www.example.com/discounts/hotel-deals",
        "http://www.example.com/discounts/flight-deals",
    ]

    operations = []
    for url in urls:
        operation = client.get_type("AssetOperation")
        page_feed_asset = operation.create.page_feed_asset
        page_feed_asset.page_url = url
        page_feed_asset.labels.append(dsa_page_url_label)
        operations.append(operation)

    asset_service = client.get_service("AssetService")
    response = asset_service.mutate_assets(
        customer_id=customer_id, operations=operations
    )

    resource_names = []
    for result in response.results:
        resource_name = result.resource_name
        print(f"Created asset with resource name '{resource_name}'")
        resource_names.append(resource_name)

    return resource_names
    # [END add_asset]