unable to make raw body request with withBody in Http client

[sdebarun]

Hi,

I am trying to add records to a zone by api call to powerdns with patch method. According to their documentation the api accept and emmits json data. I am using postman for primary testing of the api with raw json body data. In postman it works without any issue with headers for Accept and content type set to application/json and body set to raw JSON.
When I am trying to do the same in laravel with HTTP Client, with withBody it does not work. The powerdns api cannot read the data inside the body. I have tried json_encode inside the withBody as the first param and JSON as the secodn param (the content type) but no solution. I am using Laravel Framework 7.30.4. The code I am using is here,

return 
$response = Http::withHeaders(['X-API-Key' => 'secret key',
'Accept' => 'application/json',
'Content-Type' => 'application/json'])->withBody(
            json_encode([
                "rrsets" => [
                    'changetype' => 'REPLACE',
                    "name" => "test.demo.domain.test.",
                    'type' => 'TXT',
                    'records' => [
                        'content' => "LOrem ipsum dolor sit ammet",
                        'disabled' => false
                    ]
    
                ],    
                
            ]), 'JSON' 
        )->patch($hostName.$endpoint.'.demo.domain.test.');

Can some please tell me what I am doing wrong here? I'm running put of time now. and since the api works with raw body json in Postman it should also work in laravel too.
Please let me know if any more details is required.

adding zone doc of power dns : https://doc.powerdns.com/authoritative/http-api/zone.html