shopify fulfillment not working with rest api

I am trying to fulfilment by line items with shopify API but it is not working
this is my demo store

I have add all the thing original demo store name and access key

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://bforbay.myshopify.com/admin/api/2023-10/fulfillments.json',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS =>'{
    "fulfillment": {
        "line_items_by_fulfillment_order": [
            {
                "fulfillment_order_id": 5749831630946, // this one is order id
                "fulfillment_order_line_items": [
                    {
                        "id": 13418123853922, // one iteam id 
                        "quantity": 1 
                    }
                ]
            }
        ],
        "tracking_info": {
            "number": "AWEADSF898",
            "url": "https://www.my-shipping-company.com?tracking_number=MS1562678"
        }
    }
}',
  CURLOPT_HTTPHEADER => array(
    'X-Shopify-Access-Token: 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',
    'Content-Type: application/json'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

I am geting error {“errors”:”Not Found”} why?

I have read_fulfillments,write_fulfillments scope also