How to send XML POST request with Guzzle to web service API using Laravel?

I am trying to post a request to my Web API, using Laravel Guzzle Http client. However, I am getting errors trying to post the request. The data I want to send is XML as the API controller is built in XML return format.

I have tried all sorts of methods to post the request with Guzzle but it is yet to work.

public function createProperty(Request $request)
 {
    $client = new Client();

    $post = $request->all();


    $create = $client->request('POST', 'http://127.0.0.1:5111/admin/hotel', [
        'headers' => [
            'Content-Type' => 'text/xml; charset=UTF8',
        ],
        'form-data' => [
           'Name'           => $post['hotel_name'],
           'Address'        => $post['address'],
           'Phone'          => $post['phone'],
           'Email'          => $post['email'],
           'Website'        => $post['website'],
           'Latitude'       => $post['latitude'],
           'Longitude'      => $post['longitude'],
           'Tags'           => $post['tags'],
           'Priority'       => $post['priority'],
           'Visible'        => $post['visible'],
           'Stars'          => $post['stars'],
           'Description'    => $post['description'], 
           'Facilities'     => $post['facilities'],
           'Policies'       => $post['policies'],
           'ImportantInfo'  => $post['important_info'],
           'MinimumAge'     => $post['minimum_age']
       ]                            
    ]);
    //dd($create->getBody());

    echo $create->getStatusCode();
    echo $create->getHeader('content-type');
    echo $create->getBody();
    $response = $client->send($create);

    $xml_string = preg_replace('/(<\?xml[^?]+?)utf-16/i', '$1utf-8', $create->getBody());
    $xml_string = $create->getBody();
    //dd($xml_string);
    $hotels = simplexml_load_string($xml_string);

    return redirect()->back();
}

I expected the result to POST to the web service and save data to database, but however I got the error "Client error: POST 'http://127.0.0.1:5111/admin/hotel' resulted in a '400 bad request' response. Please provide a valid XML object in the body

via Chebli Mohamed