I have a problem whit call an API with Laravel.
I wont to call an api with a request like this (this is an example of json request):

{
   "costCenterCode":"CDC-00070964",
   "paperless":"false",
   "shipmentDate":"2020-11-26T08:02:20.986+0000",
   "waybills":[
      {
         "clientReferenceId":"12312312341",
         "printFormat":"A4",
         "product":"APT000901",
         "data":{
            "declared":[
               {
                  "weight":"10",
                  "height":"10",
                  "length":"30",
                  "width":"25"
               }
            ],
         }
      }
   ]
}

This is my post code:

$insert = Http::withHeaders([
            'POSTE_clientID' => '4815fd18-xxxx-xxxx-xxxx-d1a1edbd7a12',
            'Authorization' => $auth,
        ])->post('https://apiw.gp.posteitaliane.it/gp/internet/postalandlogistics/parcel/waybill', [
            "costCenterCode" => "CDC-00051975",
            "paperless" => "false",
            "shipmentDate" => "2024-06-29T08=>02=>20.986+0000",
            "waybills" => [
                "clientReferenceId" => "1404343485",
                "printFormat" => "A4",
                "product" => "APT000901",
                "data" => [
                    "declared" => [
                        "weight" => "0",
                        "height" => "44",
                        "length" => "30",
                        "width" => "25"
                    ],
                ]
            ]
        ])->json();

What i wrong? There is an array of object, i dont’t now.
Can you help me?