AUTHORIZATION_INVALID_TOKEN, The access token provided is expired, revoked or malformed

Hi,

I’m trying with PHP but always getting this error my code like this

<?php

require_once 'vendor/autoload.php';

use DocuSign\eSign\Client\ApiClient;

use DocuSign\eSign\Configuration;

use DocuSign\eSign\Api\EnvelopesApi;

use DocuSign\eSign\Model\EnvelopeDefinition;

use DocuSign\eSign\Model\Signer;

use DocuSign\eSign\Model\Recipients;

use DocuSign\eSign\Model\Document;

use Firebase\JWT\JWT;

$integrationKey = '9eaed807-bd9f-4d38-b858-37f6eccc6b73'; // Your Integration Key

$userId = 'd4300ed6-aa42-47cd-b687-01c825726abd'; // Your User ID (GUID)

$privateKey = file_get_contents('key.pem'); // Path to your private key

$accountId = '8c637b59-afa2-4821-8c5d-981bacf4ddde'; // Your Account ID

// Set the current time and expiration time

$now = time();

$expiration = $now + 3600000; // Token valid for 1 hour

// Create the JWT payload

$payload = [

    'iss' => $integrationKey,

    'sub' => $userId,

    'iat' => $now,

    'exp' => $expiration,

    'aud' => 'demo.docusign.net',  //aud: Should be set to account.docusign.com for production or demo.docusign.net for the demo environment.

    'scope' => 'signature impersonation'

];

// Generate the JWT

$jwt = JWT::encode($payload, $privateKey, 'RS256');

// Create a new ApiClient and configure it

$config = new Configuration();

$config->setHost('https://demo.docusign.net/restapi'); // Use demo for sandbox

$apiClient = new ApiClient($config);

// Add the Authorization header

$apiClient->getConfig()->addDefaultHeader('Authorization', 'Bearer ' . $jwt);

// Create an envelope definition

$envelopeDefinition = new EnvelopeDefinition();

$envelopeDefinition->setEmailSubject("Please sign this document");

// Create a document

$document = new Document();

$document->setDocumentBase64(base64_encode(file_get_contents('test.pdf')));

$document->setName('Sample Document');

$document->setFileExtension('pdf');

$document->setDocumentId('1');

$envelopeDefinition->setDocuments([$document]);

// Create a signer

$signer = new Signer();

$signer->setEmail('test@gmail.com');

$signer->setName('Uday');

$signer->setRecipientId('1');

// Add signer to recipients

$recipients = new Recipients();

$recipients->setSigners([$signer]);

// Add recipients to envelope

$envelopeDefinition->setRecipients($recipients);

// Set envelope status to 'sent'

$envelopeDefinition->setStatus('sent');

// Create EnvelopesApi instance

$envelopesApi = new EnvelopesApi($apiClient);

try {

    // Send the envelope

    $result = $envelopesApi->createEnvelope($accountId, $envelopeDefinition);

    echo "Envelope has been sent successfully! Envelope ID: " . $result->getEnvelopeId();

} catch (Exception $e) {

    echo "Error sending envelope: " . $e->getMessage();

}