Fulfillment Service based on Originial Order

Hi,

I would like to know if there’s any Shopify REST api for Fulfillments based only on Orders and not Fulfillment Orders. I understand that there was one such api however perhaps that’s deprecated. I’m trying below one but it gives a 404 -

/admin/api/2023-07/orders/{order_id}/fulfillments.json

{

  "fulfillment": {

    "location_id": 123456789,

    "tracking_number": "123456789",

    "line_items": [

      {

        "id": 123456789,

        "quantity": 1

      }

    ]

  }

}

The problem is that we are sending the original order line items to our ERP and we get that back during the Shipment process. However the Fulfillment API (for FulfillmentOrders) expects the fulfillment_order_line_item id. Hence we are looking at options to send the Fulfillment requests based on original order and not the fulfillment order.