diff --git a/src/Verify2/Request/SilentAuthRequest.php b/src/Verify2/Request/SilentAuthRequest.php
index 853291d0..4a74c046 100644
--- a/src/Verify2/Request/SilentAuthRequest.php
+++ b/src/Verify2/Request/SilentAuthRequest.php
@@ -9,8 +9,14 @@ class SilentAuthRequest extends BaseVerifyRequest
     public function __construct(
         protected string $to,
         protected string $brand,
+        protected ?string $redirectUrl = null
     ) {
         $workflow = new VerificationWorkflow(VerificationWorkflow::WORKFLOW_SILENT_AUTH, $to);
+
+        if ($this->redirectUrl) {
+            $workflow->setCustomKeys(['redirect_url' => $this->redirectUrl]);
+        }
+
         $this->addWorkflow($workflow);
     }
 
@@ -21,4 +27,4 @@ public function toArray(): array
             'workflow' => $this->getWorkflows()
         ];
     }
-}
\ No newline at end of file
+}
diff --git a/src/Verify2/VerifyObjects/VerificationWorkflow.php b/src/Verify2/VerifyObjects/VerificationWorkflow.php
index 129e7733..a823b2f6 100644
--- a/src/Verify2/VerifyObjects/VerificationWorkflow.php
+++ b/src/Verify2/VerifyObjects/VerificationWorkflow.php
@@ -25,7 +25,8 @@ class VerificationWorkflow implements ArrayHydrateInterface
     public function __construct(
         protected string $channel,
         protected string $to,
-        protected string $from = ''
+        protected string $from = '',
+        protected array $customKeys = []
     ) {
         if (! in_array($channel, $this->allowedWorkflows, true)) {
             throw new \InvalidArgumentException($this->channel . ' is not a valid workflow');
@@ -91,6 +92,24 @@ public function toArray(): array
             $returnArray['from'] = $this->getFrom();
         }
 
+        if (!empty($this->customKeys)) {
+            foreach ($this->customKeys as $key => $value) {
+                $returnArray[$key] = $value;
+            }
+        }
+
         return $returnArray;
     }
+
+    public function getCustomKeys(): array
+    {
+        return $this->customKeys;
+    }
+
+    public function setCustomKeys(array $customKeys): self
+    {
+        $this->customKeys = $customKeys;
+
+        return $this;
+    }
 }
diff --git a/test/Verify2/ClientTest.php b/test/Verify2/ClientTest.php
index 6d7be95a..2a4fe176 100644
--- a/test/Verify2/ClientTest.php
+++ b/test/Verify2/ClientTest.php
@@ -393,6 +393,33 @@ public function testCanRequestSilentAuth(): void
         $this->assertEquals('https://api.nexmo.com/v2/verify/c11236f4-00bf-4b89-84ba-88b25df97315/silent-auth/redirect', $result['check_url']);
     }
 
+    public function testCanRequestSilentAuthWithRedirectUrl(): void
+    {
+        $payload = [
+            'to' => '07784587411',
+            'brand' => 'my-brand',
+            'redirect_url' => 'https://my-app-endpoint/webhook'
+        ];
+
+        $silentAuthRequest = new SilentAuthRequest($payload['to'], $payload['brand'], $payload['redirect_url']);
+
+        $this->vonageClient->send(Argument::that(function (Request $request) use ($payload) {
+            $this->assertRequestJsonBodyContains('brand', $payload['brand'], $request);
+            $this->assertRequestJsonBodyContains('to', $payload['to'], $request, true);
+            $this->assertRequestJsonBodyContains('channel', 'silent_auth', $request, true);
+            $this->assertRequestJsonBodyContains('redirect_url', 'https://my-app-endpoint/webhook', $request, true);
+            $this->assertEquals('POST', $request->getMethod());
+
+            return true;
+        }))->willReturn($this->getResponse('verify-silent-auth-request-success', 202));
+
+        $result = $this->verify2Client->startVerification($silentAuthRequest);
+        $this->assertIsArray($result);
+        $this->assertArrayHasKey('request_id', $result);
+        $this->assertArrayHasKey('check_url', $result);
+        $this->assertEquals('https://api.nexmo.com/v2/verify/c11236f4-00bf-4b89-84ba-88b25df97315/silent-auth/redirect', $result['check_url']);
+    }
+
     public function testCannotSendConcurrentVerifications(): void
     {
         $this->expectException(Client\Exception\Request::class);