diff --git a/README.md b/README.md
index 21724ef..e46f1d3 100644
--- a/README.md
+++ b/README.md
@@ -43,11 +43,11 @@ UNIFI_ACCESS_SSL_VERIFY=false
 use Carbon\Carbon;
 use GuzzleHttp\Client as GuzzleHttpClient;
 use Uxicodev\UnifiAccessApi\API\Enums\VisitReason;
-use Uxicodev\UnifiAccessApi\API\Requests\Visitor\VisitorRequest;
+use Uxicodev\UnifiAccessApi\API\Requests\Visitor\UpsertVisitorRequest;
 use Uxicodev\UnifiAccessApi\UnifiAccessApiFacade;
 
 $unifiClient = UnifiAccessApiFacade::getClient();
-$visitorRequest = new VisitorRequest('Jimmy', 'McGill', Carbon::now(), Carbon::now()->addHour(), VisitReason::Others);
+$visitorRequest = new UpsertVisitorRequest('Jimmy', 'McGill', Carbon::now(), Carbon::now()->addHour(), VisitReason::Others);
 $visitorResponse = $unifiClient->visitor()->create($visitorRequest);
 $unifiClient->visitor()->assignQrCode($visitorResponse->data->id);
 $tmpFile = $unifiClient->credential()->downloadQrCode($visitorResponse->data->id);
@@ -58,7 +58,7 @@ $tmpFile = $unifiClient->credential()->downloadQrCode($visitorResponse->data->id
 ```php
 use Carbon\Carbon;
 use Uxicodev\UnifiAccessApi\API\Enums\VisitReason;
-use Uxicodev\UnifiAccessApi\API\Requests\Visitor\VisitorRequest;
+use Uxicodev\UnifiAccessApi\API\Requests\Visitor\UpsertVisitorRequest;
 use Uxicodev\UnifiAccessApi\Client\Client as UnifiClient;
 use GuzzleHttp\Client as GuzzleHttpClient;
 
@@ -75,7 +75,7 @@ $guzzleClient = new GuzzleHttpClient([
 ]);
             
 $unifiClient = new UnifiClient($guzzleClient);
-$visitorRequest = new VisitorRequest('Jimmy', 'McGill', Carbon::now(), Carbon::now()->addHour(), VisitReason::Others);
+$visitorRequest = new UpsertVisitorRequest('Jimmy', 'McGill', Carbon::now(), Carbon::now()->addHour(), VisitReason::Others);
 $visitorResponse = $unifiClient->visitor()->create($visitorRequest);
 $unifiClient->visitor()->assignQrCode($visitorResponse->data->id);
 $tmpFile = $unifiClient->credential()->downloadQrCode($visitorResponse->data->id);
diff --git a/src/API/Enums/Expand.php b/src/API/Enums/Expand.php
new file mode 100644
index 0000000..950e892
--- /dev/null
+++ b/src/API/Enums/Expand.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Uxicodev\UnifiAccessApi\API\Enums;
+
+/**
+ * Enum for expand[] query parameter in VisitorClient::all
+ *
+ * UniFi Access Requirement: 1.22.16 or later
+ *
+ * - none: No object will be returned
+ * - access_policy
+ * - resource
+ * - schedule
+ * - nfc_card
+ * - pin_code
+ */
+enum Expand: string
+{
+    case NONE = 'none';
+    case ACCESS_POLICY = 'access_policy';
+    case RESOURCE = 'resource';
+    case SCHEDULE = 'schedule';
+    case NFC_CARD = 'nfc_card';
+    case PIN_CODE = 'pin_code';
+}
diff --git a/src/API/Requests/Visitor/AllVisitorRequest.php b/src/API/Requests/Visitor/AllVisitorRequest.php
new file mode 100644
index 0000000..411213c
--- /dev/null
+++ b/src/API/Requests/Visitor/AllVisitorRequest.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Uxicodev\UnifiAccessApi\API\Requests\Visitor;
+
+use Uxicodev\UnifiAccessApi\API\Enums\Expand;
+
+readonly class AllVisitorRequest
+{
+    public function __construct(
+        public ?int $status = null,
+        public ?string $keyword = null,
+        public ?int $page_num = null,
+        public ?int $page_size = null,
+        /** @var Expand[]|null $expand */
+        public ?array $expand = null,
+    ) {}
+
+    /**
+     * Returns the query string for the request, using http_build_query and correct expand[] handling.
+     */
+    public function toQueryString(): string
+    {
+        $query = [];
+        if ($this->status !== null) {
+            $query['status'] = $this->status;
+        }
+        if ($this->keyword !== null) {
+            $query['keyword'] = $this->keyword;
+        }
+        if ($this->page_num !== null) {
+            $query['page_num'] = $this->page_num;
+        }
+        if ($this->page_size !== null) {
+            $query['page_size'] = $this->page_size;
+        }
+        if ($this->expand) {
+            $query['expand'] = array_map(fn (Expand $e) => $e->value, $this->expand);
+        }
+
+        return $query ? '?'.http_build_query($query) : '';
+    }
+}
diff --git a/src/API/Requests/Visitor/VisitorRequest.php b/src/API/Requests/Visitor/UpsertVisitorRequest.php
similarity index 98%
rename from src/API/Requests/Visitor/VisitorRequest.php
rename to src/API/Requests/Visitor/UpsertVisitorRequest.php
index 2981d25..48a5ffe 100644
--- a/src/API/Requests/Visitor/VisitorRequest.php
+++ b/src/API/Requests/Visitor/UpsertVisitorRequest.php
@@ -9,7 +9,7 @@
 use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
 use Uxicodev\UnifiAccessApi\Exceptions\ValidationException;
 
-readonly class VisitorRequest
+readonly class UpsertVisitorRequest
 {
     /**
      * @param  ?Collection<int, ResourceRequest>  $resources
diff --git a/src/API/VisitorClient.php b/src/API/VisitorClient.php
index eea1a30..4e28e7f 100644
--- a/src/API/VisitorClient.php
+++ b/src/API/VisitorClient.php
@@ -4,7 +4,8 @@
 
 use GuzzleHttp\Exception\GuzzleException;
 use InvalidArgumentException;
-use Uxicodev\UnifiAccessApi\API\Requests\Visitor\VisitorRequest;
+use Uxicodev\UnifiAccessApi\API\Requests\Visitor\AllVisitorRequest;
+use Uxicodev\UnifiAccessApi\API\Requests\Visitor\UpsertVisitorRequest;
 use Uxicodev\UnifiAccessApi\API\Responses\UnifiResponse;
 use Uxicodev\UnifiAccessApi\API\Responses\Visitor\VisitorResponse;
 use Uxicodev\UnifiAccessApi\API\Responses\Visitor\VisitorsResponse;
@@ -35,9 +36,9 @@ public function find(UuidV4 $visitorId): VisitorResponse
      * @throws GuzzleException
      * @throws UnifiApiErrorException
      */
-    public function all(): VisitorsResponse
+    public function all(?AllVisitorRequest $request = null): VisitorsResponse
     {
-        $response = $this->client->get($this::ENDPOINT);
+        $response = $this->client->get($this::ENDPOINT. ($request !== null ? $request->toQueryString() : ''));
 
         $data = json_decode($response->getBody()->getContents(), true);
 
@@ -49,7 +50,7 @@ public function all(): VisitorsResponse
      * @throws GuzzleException
      * @throws UnifiApiErrorException
      */
-    public function create(VisitorRequest $request): VisitorResponse
+    public function create(UpsertVisitorRequest $request): VisitorResponse
     {
         $response = $this->client->post($this::ENDPOINT, $request->toArray());
 
@@ -58,7 +59,12 @@ public function create(VisitorRequest $request): VisitorResponse
         return VisitorResponse::fromArray($data);
     }
 
-    public function update(VisitorRequest $request): VisitorResponse
+    /**
+     * @throws GuzzleException
+     * @throws InvalidResponseException
+     * @throws UnifiApiErrorException
+     */
+    public function update(UpsertVisitorRequest $request): VisitorResponse
     {
         if ($request->id === null) {
             throw new InvalidArgumentException('Visitor ID is required for update.');
diff --git a/tests/API/Requests/System/SystemLogRequestTest.php b/tests/API/Requests/System/SystemLogRequestTest.php
index 8fff0da..3ae486b 100644
--- a/tests/API/Requests/System/SystemLogRequestTest.php
+++ b/tests/API/Requests/System/SystemLogRequestTest.php
@@ -8,7 +8,6 @@
 use PHPUnit\Framework\TestCase;
 use Uxicodev\UnifiAccessApi\API\Enums\SystemLogTopic;
 use Uxicodev\UnifiAccessApi\API\Requests\System\SystemLogRequest;
-use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
 use Uxicodev\UnifiAccessApi\Exceptions\ValidationException;
 
 class SystemLogRequestTest extends TestCase
@@ -64,4 +63,3 @@ public function test_from_array_until_not_after_since(): void
         }
     }
 }
-
diff --git a/tests/API/Requests/Visitor/AllVisitorRequestTest.php b/tests/API/Requests/Visitor/AllVisitorRequestTest.php
new file mode 100644
index 0000000..b819271
--- /dev/null
+++ b/tests/API/Requests/Visitor/AllVisitorRequestTest.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Uxicodev\UnifiAccessApi\Tests\API\Requests\Visitor;
+
+use PHPUnit\Framework\TestCase;
+use Uxicodev\UnifiAccessApi\API\Enums\Expand;
+use Uxicodev\UnifiAccessApi\API\Requests\Visitor\AllVisitorRequest;
+
+class AllVisitorRequestTest extends TestCase
+{
+    public function test_default_query_string_is_empty(): void
+    {
+        $request = new AllVisitorRequest();
+        $this->assertSame('', $request->toQueryString());
+    }
+
+    public function test_query_string_with_all_params(): void
+    {
+        $request = new AllVisitorRequest(
+            status: 2,
+            keyword: 'John',
+            page_num: 3,
+            page_size: 25,
+            expand: [Expand::ACCESS_POLICY, Expand::RESOURCE]
+        );
+        $query = $request->toQueryString();
+        $this->assertStringContainsString('status=2', $query);
+        $this->assertStringContainsString('keyword=John', $query);
+        $this->assertStringContainsString('page_num=3', $query);
+        $this->assertStringContainsString('page_size=25', $query);
+        $this->assertStringContainsString('expand%5B0%5D=access_policy', $query);
+        $this->assertStringContainsString('expand%5B1%5D=resource', $query);
+        $this->assertStringStartsWith('?', $query);
+    }
+
+    public function test_query_string_with_empty_expand(): void
+    {
+        $request = new AllVisitorRequest(expand: []);
+        $this->assertSame('', $request->toQueryString());
+    }
+}
+
diff --git a/tests/API/Requests/Visitor/VisitorRequestTest.php b/tests/API/Requests/Visitor/VisitorRequestTest.php
index d0d88e6..a84eaef 100644
--- a/tests/API/Requests/Visitor/VisitorRequestTest.php
+++ b/tests/API/Requests/Visitor/VisitorRequestTest.php
@@ -5,7 +5,7 @@
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
 use Uxicodev\UnifiAccessApi\API\Enums\VisitReason;
-use Uxicodev\UnifiAccessApi\API\Requests\Visitor\VisitorRequest;
+use Uxicodev\UnifiAccessApi\API\Requests\Visitor\UpsertVisitorRequest;
 use Uxicodev\UnifiAccessApi\Exceptions\ValidationException;
 
 class VisitorRequestTest extends TestCase
@@ -14,7 +14,7 @@ class VisitorRequestTest extends TestCase
     public function construct_throws_error_when_phone_number_is_not_e164_compliant(): void
     {
         $this->expectException(ValidationException::class);
-        new VisitorRequest(
+        new UpsertVisitorRequest(
             'John',
             'Doe',
             now(),
@@ -36,9 +36,9 @@ public function can_be_constructed_from_array(): void
             'mobile_phone' => '+1234567890',
         ];
 
-        $visitorRequest = VisitorRequest::fromArray($data);
+        $visitorRequest = UpsertVisitorRequest::fromArray($data);
 
-        $this->assertInstanceOf(VisitorRequest::class, $visitorRequest);
+        $this->assertInstanceOf(UpsertVisitorRequest::class, $visitorRequest);
         $this->assertEquals('Jane', $visitorRequest->first_name);
         $this->assertEquals('Doe', $visitorRequest->last_name);
         $this->assertEquals(VisitReason::Business, $visitorRequest->visit_reason);
diff --git a/tests/API/VisitorClientTest.php b/tests/API/VisitorClientTest.php
index e292b69..c08f818 100644
--- a/tests/API/VisitorClientTest.php
+++ b/tests/API/VisitorClientTest.php
@@ -11,7 +11,7 @@
 use Orchestra\Testbench\TestCase;
 use PHPUnit\Framework\Attributes\Test;
 use Uxicodev\UnifiAccessApi\API\Enums\VisitReason;
-use Uxicodev\UnifiAccessApi\API\Requests\Visitor\VisitorRequest;
+use Uxicodev\UnifiAccessApi\API\Requests\Visitor\UpsertVisitorRequest;
 use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
 use Uxicodev\UnifiAccessApi\Client\Client as UnifiClient;
 use Uxicodev\UnifiAccessApi\Entities\Visitor\VisitorEntity;
@@ -95,7 +95,7 @@ public function create_a_visitor_returns_visitor_response(): void
 
         $unifiClient = new UnifiClient($client);
 
-        $response = $unifiClient->visitor()->create(new VisitorRequest(
+        $response = $unifiClient->visitor()->create(new UpsertVisitorRequest(
             'Saul',
             'Goodman',
             Carbon::now(),
@@ -122,7 +122,7 @@ public function bad_request_response_throws_exception(): void
         $unifiClient = new UnifiClient($client);
 
         $this->expectException(InvalidResponseException::class);
-        $unifiClient->visitor()->create(new VisitorRequest(
+        $unifiClient->visitor()->create(new UpsertVisitorRequest(
             'Saul',
             'Goodman',
             Carbon::now(),
@@ -144,7 +144,7 @@ public function non_success_code_in_response_throws_unifi_api_error_exception():
         $unifiClient = new UnifiClient($client);
 
         $this->expectException(UnifiApiErrorException::class);
-        $unifiClient->visitor()->create(new VisitorRequest(
+        $unifiClient->visitor()->create(new UpsertVisitorRequest(
             'Saul',
             'Goodman',
             Carbon::now(),
@@ -164,7 +164,7 @@ public function edit_visitor_without_id_throws_error(): void
         $unifiClient = new UnifiClient($client);
 
         $this->expectException(InvalidArgumentException::class);
-        $unifiClient->visitor()->update(new VisitorRequest(
+        $unifiClient->visitor()->update(new UpsertVisitorRequest(
             'Saul',
             'Goodman',
             Carbon::now(),
@@ -185,7 +185,7 @@ public function a_visitor_can_be_edited(): void
 
         $unifiClient = new UnifiClient($client);
 
-        $response = $unifiClient->visitor()->update(new VisitorRequest(
+        $response = $unifiClient->visitor()->update(new UpsertVisitorRequest(
             'Saul',
             'Goodman',
             Carbon::now(),
@@ -212,7 +212,7 @@ public function a_failed_edit_throws_an_exception(): void
 
         $this->expectException(InvalidResponseException::class);
 
-        $response = $unifiClient->visitor()->update(new VisitorRequest(
+        $response = $unifiClient->visitor()->update(new UpsertVisitorRequest(
             'Saul',
             'Goodman',
             Carbon::now(),