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Want to send a fax from a different fax number to my ring central number or account(admin portal) using RingCentral sdk (fax API)

The code I am using is:-

require('vendor/autoload.php');

$dotenv = Dotenv\Dotenv::createImmutable(__DIR__ . '/../');

$dotenv->load();

$RECIPIENT = $_ENV['FAX_RECIPIENT'];

$rcsdk = new RingCentral\SDK\SDK( $_ENV['RC_CLIENT_ID'],

$_ENV['RC_CLIENT_SECRET'],

$_ENV['RC_SERVER_URL'] );

$platform = $rcsdk->platform();

$platform->login( [ "jwt" => $_ENV['RC_JWT'] ] );

$request = $rcsdk->createMultipartBuilder()

->setBody(array(

'to' => array(array('phoneNumber' => $RECIPIENT)),

'faxResolution' => 'High',

))

->add(fopen('test.jpg', 'r'))

->request('/account/~/extension/~/fax');

$resp = $platform->sendRequest($request);

print_r ("FAX sent. Message status: " . $resp->json()->messageStatus);