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I am facing error

==================================

Exception: Response has unsuccessful status in

/var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Http/Client.php:44

Stack trace:

#0 /var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Platform/Platform.php(310):

RingCentral\SDK\Http\Client->send(Object(GuzzleHttp\Psr7\Request))

#1 /var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Platform/Platform.php(434):

RingCentral\SDK\Platform\Platform->sendRequest(Object(GuzzleHttp\Psr7\Request), Array)

#2 /var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Platform/Platform.php(212):

RingCentral\SDK\Platform\Platform->requestToken('/restapi/oauth/...', Array)

#3 /var/www/html/api/public_html/sendSMS.php(38): RingCentral\SDK\Platform\Platform->login(Array)

#4 {main}

Next RingCentral\SDK\Http\ApiException: Unauthorized for this grant type in

/var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Http/Client.php:52

Stack trace:

#0 /var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Platform/Platform.php(310):

RingCentral\SDK\Http\Client->send(Object(GuzzleHttp\Psr7\Request))

#1 /var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Platform/Platform.php(434):

RingCentral\SDK\Platform\Platform->sendRequest(Object(GuzzleHttp\Psr7\Request), Array)

#2 /var/www/html/api/public_html/vendor/ringcentral/ringcentral-php/src/Platform/Platform.php(212):

RingCentral\SDK\Platform\Platform->requestToken('/restapi/oauth/...', Array)

#3 /var/www/html/api/public_html/sendSMS.php(38): RingCentral\SDK\Platform\Platform->login(Array)

#4 {main}Unable to authenticate to platform. Check credentials.

==========

My Code

<?php
//Header config
require __DIR__ . '/header.php';
/**Db connect */
require __DIR__ . '/dbConnect.php';
/**Ringcentral vendor config */
require __DIR__ . '/vendor/autoload.php';


//fetch all keys from database
//$query = 'SELECT * FROM public."Settings"';
//$result = pg_query($db, $query);
//while ($row = pg_fetch_assoc($result)) {
  
  
  $clientId = 'Xis4z9ojiqff8kozXxEFcQ';
  $clientSecret = '48TxqwJG...';
  $jwtToken = 'eyJraWQiOiI4...';
  $fromNumber = '+1704626XXX';
//}


$serverUrl = 'https://platform.ringcentral.com';


//$jsonValue = $_GET['finalJson'];
//$jsonValue = json_decode($jsonValue);


//receipient number
$receipientNo = '+1480409XXX';


// sms content
$message = 'Hello Sky';


# Instantiate the SDK and get the platform instance
$rcsdk = new RingCentral\SDK\SDK( $clientId,
$clientSecret,
$serverUrl );
$platform = $rcsdk->platform();


// Authenticate a user using a personal JWT token
try {
  
  
  $platform->login( [ "jwt" => $jwtToken ] );
  send_sms($fromNumber);
} catch (\RingCentral\SDK\Http\ApiException $e) {
  
  
  echo $e;
  exit("Unable to authenticate to platform. Check credentials. ");
}


/*
Read phone number(s) that belongs to the authenticated user and detect if a phone number
has the SMS capability
*/
function read_extension_phone_number_detect_sms_feature(){
  
  
  global $platform;
  $endpoint = "/restapi/v1.0/account/~/extension/~/phone-number";
  $resp = $platform->get($endpoint);
  $jsonObj = $resp->json();
  foreach ($resp->json()->records as $record){
  
  
    foreach ($record->features as $feature){
  
  
      if ($feature == "SmsSender"){
  
  
        // If a user has multiple phone numbers, check and decide which number
        // to be used for sending SMS message.
        return send_sms($record->phoneNumber);
      }
    }
  }
  if (count($jsonObj->records) == 0){
  
  
    exit("This user does not own a phone number!");
  }else{
  
  
    exit("None of this user's phone number(s) has the SMS capability!");
  }
}

/*
Send a text message from a user own phone number to a recipient number
*/
function send_sms($FROM_NUMBER){
  
  
  global $platform, $receipientNo, $message;
  try {
  
  
    $requestBody = array(
      'from' => array ('phoneNumber' => $FROM_NUMBER),
      'to' => array( array('phoneNumber' => $receipientNo) ),
      // To send group messaging, add more (max 10 recipients) 'phoneNumber' object. E.g.
    /*
    'to' => array(
    array('phoneNumber' => $receipientNo),
      array('phoneNumber' => 'Recipient-Phone-Number')
    ),
    */
    'text' => $message
    );
    $endpoint = "/account/~/extension/~/sms";
    $resp = $platform->post($endpoint, $requestBody);
    $jsonObj = $resp->json();
    print("SMS sent. Message id: " . $jsonObj->id . PHP_EOL);
    check_message_status($jsonObj->id);
  } catch (\RingCentral\SDK\Http\ApiException $e) {
  
  
    exit("Error message: " . $e->message . PHP_EOL);
  }
}

/*
Check the sending message status until it's out of the queued status
*/
function check_message_status($messageId){
  
  
  global $platform;
  try {
  
  
    $endpoint = "/restapi/v1.0/account/~/extension/~/message-store/".$messageId;
    $resp = $platform->get($endpoint);
    $jsonObj = $resp->json();
    print("Message status: " . $jsonObj->messageStatus . PHP_EOL);
    if ($jsonObj->messageStatus == "Queued"){
  
  
      sleep(2);
      check_message_status($jsonObj->id);
    }
  } catch (\RingCentral\SDK\Http\ApiException $e) {
  
  
    exit("Error message: " . $e->message . PHP_EOL);
  }
}
?>

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