diff --git a/examples/appearance-demo.php b/examples/appearance-demo.php
new file mode 100644
index 0000000..35c8368
--- /dev/null
+++ b/examples/appearance-demo.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\Handler\CurlHandler;
+use Http\Factory\Guzzle\RequestFactory;
+use Http\Factory\Guzzle\StreamFactory;
+use Mjelamanov\GuzzlePsr18\Client as Psr18Wrapper;
+use setasign\SetaPDF\Signer\Module\GlobalTrustTrust2Go\Client;
+use setasign\SetaPDF\Signer\Module\GlobalTrustTrust2Go\Module;
+
+date_default_timezone_set('Europe/Berlin');
+error_reporting(E_ALL | E_STRICT);
+ini_set('display_errors', '1');
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+if (!file_exists(__DIR__ . '/settings.php')) {
+    throw new RuntimeException('Missing settings.php!');
+}
+$settings = require __DIR__ . '/settings.php';
+
+$file = __DIR__ . '/files/Laboratory-Report.pdf';
+$certificateSerialNumber = $settings['certificateSerialNumber'];
+// A requestID generated by the client to identify this signature operation (6 alphanumeric characters)
+$requestId = '123456';
+
+$caBundle = realpath(__DIR__ . '/files/globaltrust-all.pem');
+
+$httpClient = new GuzzleClient([
+    'handler' => new CurlHandler(),
+    // note: guzzle requires this parameter to fully support PSR-18
+    'http_errors' => false,
+    'verify' => $caBundle,
+    // timeout by api after ~300 seconds
+    'timeout' => 360,
+]);
+// only required if you are using guzzle < 7
+$httpClient = new Psr18Wrapper($httpClient);
+$requestFactory = new RequestFactory();
+$streamFactory = new StreamFactory();
+
+$client = new Client(
+    $httpClient,
+    $requestFactory,
+    $streamFactory,
+    $settings['apiUrl'],
+    $settings['username'],
+    $settings['activationPin']
+);
+//var_dump($client->getCertificates());die();
+
+$module = new Module($client, $requestId, $certificateSerialNumber);
+$module->setDigest(SetaPDF_Signer_Digest::SHA_512);
+
+$certificate = $client->getCertificateBySerialNumber($certificateSerialNumber);
+$module->setCertificate($certificate['certificate']);
+$module->setExtraCertificates($certificate['chain']);
+
+$reader = new SetaPDF_Core_Reader_File($file);
+$writer = new SetaPDF_Core_Writer_File(__DIR__ . '/signed.pdf');
+// let's get the document
+$document = SetaPDF_Core_Document::load($reader, $writer);
+
+// now let's create a signer instance
+$signer = new SetaPDF_Signer($document);
+$signer->setAllowSignatureContentLengthChange(false);
+//$signer->setSignatureContentLength(36000);
+
+//// set some signature properties
+$signer->setReason('Testing TRUST2GO');
+
+$field = $signer->addSignatureField(
+    'Signature',
+    1,
+    SetaPDF_Signer_SignatureField::POSITION_RIGHT_TOP,
+    ['x' => -160, 'y' => -100],
+    180,
+    60
+);
+
+$signer->setSignatureFieldName($field->getQualifiedName());
+
+$appearance = new SetaPDF_Signer_Signature_Appearance_Dynamic($module);
+$signer->setAppearance($appearance);
+
+$signer->sign($module);
diff --git a/src/Client.php b/src/Client.php
index 29404f5..e767cb7 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -100,13 +100,25 @@ public function getCertificates(bool $activeonly = true, bool $useronly = false)
         return \json_decode($responseBody, true);
     }
 
+    /**
+     * @param string $certificateSerialNumber
+     * @return array
+     * @throws ClientExceptionInterface
+     * @deprecated Use getCertificateBySerialNumber() instead.
+     * @see getCertificateBySerialNumber()
+     */
+    public function getCertificatesBySerialNumber(string $certificateSerialNumber): array
+    {
+        return $this->getCertificateBySerialNumber($certificateSerialNumber);
+    }
+
     /**
      * @param string $certificateSerialNumber
      * @return array{certificate: string, chain: array<string>}
      * @throws ClientExceptionInterface
      * @throws Exception
      */
-    public function getCertificatesBySerialNumber(string $certificateSerialNumber): array
+    public function getCertificateBySerialNumber(string $certificateSerialNumber): array
     {
         $certificates = $this->getCertificates();
         // search for the correct certificate chain
diff --git a/src/Module.php b/src/Module.php
index c745cbc..ab60412 100644
--- a/src/Module.php
+++ b/src/Module.php
@@ -85,6 +85,14 @@ public function setCertificate($certificate)
         $this->padesModule->setCertificate($certificate);
     }
 
+    /**
+     * @return SetaPDF_Signer_X509_Certificate|string
+     */
+    public function getCertificate()
+    {
+        return $this->padesModule->getCertificate();
+    }
+
     /**
      * Add additional certificates which are placed into the CMS structure.
      *
@@ -128,10 +136,10 @@ public function addCrl($crl)
      */
     public function createSignature(SetaPDF_Core_Reader_FilePath $tmpPath): string
     {
-        if ($this->padesModule->getCertificate() === null) {
-            $certificates = $this->client->getCertificatesBySerialNumber($this->certificateSerialNumber);
-            $this->padesModule->setCertificate($certificates['certificate']);
-            $this->padesModule->setExtraCertificates($certificates['chain']);
+        if ($this->getCertificate() === null) {
+            $certificate = $this->client->getCertificateBySerialNumber($this->certificateSerialNumber);
+            $this->setCertificate($certificate['certificate']);
+            $this->setExtraCertificates($certificate['chain']);
         }
 
         $digest = $this->padesModule->getDigest();