diff --git a/src/API/Enums/SystemLogTopic.php b/src/API/Enums/SystemLogTopic.php
new file mode 100644
index 0000000..b2490aa
--- /dev/null
+++ b/src/API/Enums/SystemLogTopic.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\API\Enums;
+
+enum SystemLogTopic: string
+{
+    /** Fetch all logs. */
+    case All = 'all';
+    /** Fetch door opening logs. */
+    case DoorOpenings = 'door_openings';
+    /** Fetch logs for device restart, deletion, offline status, and detection. */
+    case Critical = 'critical';
+    /** Fetch device update logs. */
+    case Updates = 'updates';
+    /** Fetch logs for device online status, device updates, access policy synchronization, and active/inactive door unlock schedules. */
+    case DeviceEvents = 'device_events';
+    /** Fetch logs for admin activity, such as access policy updates, settings changes, and user management. */
+    case AdminActivity = 'admin_activity';
+    /** Fetch logs of visitor-related operations. */
+    case Visitor = 'visitor';
+}
diff --git a/src/API/Requests/System/SystemLogRequest.php b/src/API/Requests/System/SystemLogRequest.php
new file mode 100644
index 0000000..873d02e
--- /dev/null
+++ b/src/API/Requests/System/SystemLogRequest.php
@@ -0,0 +1,102 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\API\Requests\System;
+
+use Carbon\Carbon;
+use Uxicodev\UnifiAccessApi\API\Enums\SystemLogTopic;
+use Uxicodev\UnifiAccessApi\API\Requests\Validators\SystemLogValidator;
+use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
+use Uxicodev\UnifiAccessApi\Exceptions\ValidationException;
+
+readonly class SystemLogRequest
+{
+    /**
+     * @throws ValidationException
+     */
+    public function __construct(
+        public SystemLogTopic $topic,
+        public Carbon $since,
+        public ?Carbon $until = null,
+        public ?UuidV4 $actor_id = null,
+        public ?int $page_size = null,
+        public ?int $page_num = null
+    ) {
+        $this::validate($this->toArray());
+    }
+
+    /**
+     * @param  array<string, mixed>  $data
+     *
+     * @throws ValidationException
+     */
+    public static function fromArray(array $data): self
+    {
+        self::validate($data);
+        $since = Carbon::parse($data['since']);
+        $until = isset($data['until']) ? Carbon::parse($data['until']) : null;
+
+        return new self(
+            SystemLogTopic::from($data['topic']),
+            $since,
+            $until,
+            isset($data['actor_id']) ? new UuidV4($data['actor_id']) : null,
+            $data['page_size'] ?? null,
+            $data['page_num'] ?? null
+        );
+    }
+
+    /**
+     * @param  array<string, mixed>  $data
+     *
+     * @throws ValidationException
+     */
+    private static function validate(array $data): void
+    {
+        $validator = new SystemLogValidator($data);
+        if (! $validator->passes()) {
+            throw new ValidationException(
+                errors: $validator->getErrors(),
+                message: 'SystemLogRequest validation failed.'
+            );
+        }
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(): array
+    {
+        return [
+            'topic' => $this->topic->value,
+            'since' => $this->since->unix(),
+            'until' => $this->until?->unix(),
+            'actor_id' => $this->actor_id?->getValue(),
+            'page_size' => $this->page_size,
+            'page_num' => $this->page_num,
+        ];
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function getQueryParams(): array
+    {
+        return [
+            'page_size' => $this->page_size,
+            'page_num' => $this->page_num,
+        ];
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function getPostBody(): array
+    {
+        return [
+            'topic' => $this->topic->value,
+            'since' => $this->since->unix(),
+            'until' => $this->until?->unix(),
+            'actor_id' => $this->actor_id?->getValue(),
+        ];
+    }
+}
diff --git a/src/API/Requests/Validators/AbstractValidator.php b/src/API/Requests/Validators/AbstractValidator.php
index 27ef0c9..9e690af 100644
--- a/src/API/Requests/Validators/AbstractValidator.php
+++ b/src/API/Requests/Validators/AbstractValidator.php
@@ -10,11 +10,29 @@ abstract class AbstractValidator implements ValidatorContract
     /** @var array<string, array<array-key, string>> */
     protected array $errors = [];
 
+    /**
+     * @var string[]
+     */
+    protected array $required = [];
+
     /**
      * @param  array<array-key, mixed>  $data
      */
     public function __construct(protected readonly array $data) {}
 
+    protected function validateRequiredFields(): bool
+    {
+        $valid = true;
+        foreach ($this->required as $field) {
+            if (! array_key_exists($field, $this->data) || $this->data[$field] === null || $this->data[$field] === '') {
+                $this->errors[$field][] = "The field '{$field}' is required.";
+                $valid = false;
+            }
+        }
+
+        return $valid;
+    }
+
     public function getErrors(): MessageBagContract
     {
         return new MessageBag($this->errors);
diff --git a/src/API/Requests/Validators/SystemLogValidator.php b/src/API/Requests/Validators/SystemLogValidator.php
new file mode 100644
index 0000000..3fd9db0
--- /dev/null
+++ b/src/API/Requests/Validators/SystemLogValidator.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\API\Requests\Validators;
+
+use Carbon\Carbon;
+
+class SystemLogValidator extends AbstractValidator
+{
+    protected array $required = ['topic', 'since'];
+
+    public function passes(): bool
+    {
+        $valid = $this->validateRequiredFields();
+        $since = $this->data['since'] ?? null;
+        $until = $this->data['until'] ?? null;
+        if ($since && $until) {
+            $sinceCarbon = $since instanceof Carbon ? $since : Carbon::parse($since);
+            $untilCarbon = $until instanceof Carbon ? $until : Carbon::parse($until);
+            if ($untilCarbon->lessThanOrEqualTo($sinceCarbon)) {
+                $this->errors['until'][] = "'until' must be after 'since'.";
+                $valid = false;
+            }
+        }
+
+        return $valid && count($this->errors) === 0;
+    }
+}
diff --git a/src/API/Responses/Resource/ResourceGroupResponse.php b/src/API/Responses/Resource/ResourceGroupResponse.php
index bf72472..46e50a0 100644
--- a/src/API/Responses/Resource/ResourceGroupResponse.php
+++ b/src/API/Responses/Resource/ResourceGroupResponse.php
@@ -4,7 +4,7 @@
 
 use Illuminate\Support\Collection;
 use Uxicodev\UnifiAccessApi\API\Responses\UnifiResponse;
-use Uxicodev\UnifiAccessApi\Entities\DoorGroupEntity;
+use Uxicodev\UnifiAccessApi\Entities\DoorGroups\DoorGroupEntity;
 
 readonly class ResourceGroupResponse extends UnifiResponse
 {
diff --git a/src/API/Responses/System/SystemLogsResponse.php b/src/API/Responses/System/SystemLogsResponse.php
new file mode 100644
index 0000000..cbf378a
--- /dev/null
+++ b/src/API/Responses/System/SystemLogsResponse.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\API\Responses\System;
+
+use Illuminate\Support\Collection;
+use Uxicodev\UnifiAccessApi\API\Responses\UnifiResponse;
+use Uxicodev\UnifiAccessApi\Entities\System\SystemLogEntity;
+
+readonly class SystemLogsResponse extends UnifiResponse
+{
+    /** @param  Collection<int, SystemLogEntity>  $logs */
+    public function __construct(
+        string $code,
+        public Collection $logs,
+        public int $page,
+        public int $total,
+    ) {
+        parent::__construct($code, '');
+    }
+
+    /**
+     * @param  array<string, mixed>  $response
+     */
+    public static function fromArray(array $response): self
+    {
+        $hits = collect($response['data']['hits'] ?? [])->map(fn ($item) => SystemLogEntity::fromArray($item));
+
+        return new self(
+            $response['code'] ?? '',
+            $hits,
+            $response['page'] ?? 1,
+            $response['total'] ?? 0
+        );
+    }
+}
diff --git a/src/API/Responses/Visitor/VisitorResponse.php b/src/API/Responses/Visitor/VisitorResponse.php
index b1c8342..f721fba 100644
--- a/src/API/Responses/Visitor/VisitorResponse.php
+++ b/src/API/Responses/Visitor/VisitorResponse.php
@@ -3,7 +3,7 @@
 namespace Uxicodev\UnifiAccessApi\API\Responses\Visitor;
 
 use Uxicodev\UnifiAccessApi\API\Responses\UnifiResponse;
-use Uxicodev\UnifiAccessApi\Entities\VisitorEntity;
+use Uxicodev\UnifiAccessApi\Entities\Visitor\VisitorEntity;
 
 readonly class VisitorResponse extends UnifiResponse
 {
diff --git a/src/API/Responses/Visitor/VisitorsResponse.php b/src/API/Responses/Visitor/VisitorsResponse.php
index e4d66ea..bf6ee1c 100644
--- a/src/API/Responses/Visitor/VisitorsResponse.php
+++ b/src/API/Responses/Visitor/VisitorsResponse.php
@@ -4,7 +4,7 @@
 
 use Illuminate\Support\Collection;
 use Uxicodev\UnifiAccessApi\API\Responses\UnifiResponse;
-use Uxicodev\UnifiAccessApi\Entities\VisitorEntity;
+use Uxicodev\UnifiAccessApi\Entities\Visitor\VisitorEntity;
 
 readonly class VisitorsResponse extends UnifiResponse
 {
diff --git a/src/API/SystemClient.php b/src/API/SystemClient.php
new file mode 100644
index 0000000..2c7ceff
--- /dev/null
+++ b/src/API/SystemClient.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\API;
+
+use GuzzleHttp\Exception\GuzzleException;
+use Uxicodev\UnifiAccessApi\API\Requests\System\SystemLogRequest;
+use Uxicodev\UnifiAccessApi\API\Responses\System\SystemLogsResponse;
+use Uxicodev\UnifiAccessApi\Exceptions\InvalidResponseException;
+use Uxicodev\UnifiAccessApi\Exceptions\UnifiApiErrorException;
+
+class SystemClient extends ApiResourceClient
+{
+    private const ENDPOINT = 'system';
+
+    /**
+     * @throws InvalidResponseException
+     * @throws GuzzleException
+     * @throws UnifiApiErrorException
+     */
+    public function logs(SystemLogRequest $request): SystemLogsResponse
+    {
+        $response = $this->client->post($this::ENDPOINT.'/logs?'.http_build_query($request->getQueryParams()),
+            $request->getPostBody()
+        );
+
+        $data = json_decode($response->getBody()->getContents(), true);
+
+        return SystemLogsResponse::fromArray($data);
+    }
+}
diff --git a/src/Client/Client.php b/src/Client/Client.php
index a7bb26b..9eac547 100644
--- a/src/Client/Client.php
+++ b/src/Client/Client.php
@@ -8,6 +8,7 @@
 use Psr\Http\Message\ResponseInterface;
 use Uxicodev\UnifiAccessApi\API\CredentialClient;
 use Uxicodev\UnifiAccessApi\API\DoorGroupsClient;
+use Uxicodev\UnifiAccessApi\API\SystemClient;
 use Uxicodev\UnifiAccessApi\API\VisitorClient;
 use Uxicodev\UnifiAccessApi\Exceptions\InvalidResponseException;
 use Uxicodev\UnifiAccessApi\Exceptions\UnifiApiErrorException;
@@ -20,11 +21,14 @@ class Client
 
     protected DoorGroupsClient $doorGroupsClient;
 
+    protected SystemClient $systemClient;
+
     public function __construct(protected GuzzleHttpClient $client)
     {
         $this->visitorClient = new VisitorClient($this);
         $this->credentialClient = new CredentialClient($this);
         $this->doorGroupsClient = new DoorGroupsClient($this);
+        $this->systemClient = new SystemClient($this);
     }
 
     /**
@@ -138,6 +142,11 @@ public function doorGroups(): DoorGroupsClient
         return $this->doorGroupsClient;
     }
 
+    public function system(): SystemClient
+    {
+        return $this->systemClient;
+    }
+
     /**
      * @throws InvalidResponseException
      * @throws UnifiApiErrorException
diff --git a/src/Entities/DoorEntity.php b/src/Entities/DoorGroups/DoorEntity.php
similarity index 92%
rename from src/Entities/DoorEntity.php
rename to src/Entities/DoorGroups/DoorEntity.php
index 37603ee..61ab158 100644
--- a/src/Entities/DoorEntity.php
+++ b/src/Entities/DoorGroups/DoorEntity.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Uxicodev\UnifiAccessApi\Entities;
+namespace Uxicodev\UnifiAccessApi\Entities\DoorGroups;
 
 use Uxicodev\UnifiAccessApi\API\Enums\ResourceType;
 use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
diff --git a/src/Entities/DoorGroupEntity.php b/src/Entities/DoorGroups/DoorGroupEntity.php
similarity index 94%
rename from src/Entities/DoorGroupEntity.php
rename to src/Entities/DoorGroups/DoorGroupEntity.php
index 04d47fa..e961197 100644
--- a/src/Entities/DoorGroupEntity.php
+++ b/src/Entities/DoorGroups/DoorGroupEntity.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Uxicodev\UnifiAccessApi\Entities;
+namespace Uxicodev\UnifiAccessApi\Entities\DoorGroups;
 
 use Illuminate\Support\Collection;
 use Uxicodev\UnifiAccessApi\API\Enums\ResourceType;
diff --git a/src/Entities/ResourceTopologyEntity.php b/src/Entities/DoorGroups/ResourceTopologyEntity.php
similarity index 94%
rename from src/Entities/ResourceTopologyEntity.php
rename to src/Entities/DoorGroups/ResourceTopologyEntity.php
index c059675..a178954 100644
--- a/src/Entities/ResourceTopologyEntity.php
+++ b/src/Entities/DoorGroups/ResourceTopologyEntity.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Uxicodev\UnifiAccessApi\Entities;
+namespace Uxicodev\UnifiAccessApi\Entities\DoorGroups;
 
 use Illuminate\Support\Collection;
 use Uxicodev\UnifiAccessApi\API\Enums\ResourceType;
diff --git a/src/Entities/System/SystemLogActorEntity.php b/src/Entities/System/SystemLogActorEntity.php
new file mode 100644
index 0000000..2ae023b
--- /dev/null
+++ b/src/Entities/System/SystemLogActorEntity.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\Entities\System;
+
+readonly class SystemLogActorEntity
+{
+    public function __construct(
+        public string $alternate_id,
+        public string $alternate_name,
+        public string $display_name,
+        public string $id,
+        public string $type
+    ) {}
+
+    /** @param  array<array-key, string>  $data */
+    public static function fromArray(array $data): self
+    {
+        return new self(
+            $data['alternate_id'] ?? '',
+            $data['alternate_name'] ?? '',
+            $data['display_name'] ?? '',
+            $data['id'] ?? '',
+            $data['type'] ?? ''
+        );
+    }
+}
diff --git a/src/Entities/System/SystemLogAuthenticationEntity.php b/src/Entities/System/SystemLogAuthenticationEntity.php
new file mode 100644
index 0000000..2dbdcdc
--- /dev/null
+++ b/src/Entities/System/SystemLogAuthenticationEntity.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\Entities\System;
+
+readonly class SystemLogAuthenticationEntity
+{
+    public function __construct(
+        public string $credential_provider,
+        public string $issuer
+    ) {}
+
+    /** @param  array<array-key, string>  $data */
+    public static function fromArray(array $data): self
+    {
+        return new self(
+            $data['credential_provider'] ?? '',
+            $data['issuer'] ?? ''
+        );
+    }
+}
diff --git a/src/Entities/System/SystemLogEntity.php b/src/Entities/System/SystemLogEntity.php
new file mode 100644
index 0000000..94680e9
--- /dev/null
+++ b/src/Entities/System/SystemLogEntity.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\Entities\System;
+
+use Carbon\Carbon;
+
+readonly class SystemLogEntity
+{
+    /** @param SystemLogTargetEntity[] $target */
+    public function __construct(
+        public Carbon $timestamp,
+        public string $_id,
+        public SystemLogActorEntity $actor,
+        public SystemLogAuthenticationEntity $authentication,
+        public SystemLogEventEntity $event,
+        public array $target,
+        public string $tag
+    ) {}
+
+    /** @param  array<array-key, mixed>  $data */
+    public static function fromArray(array $data): self
+    {
+        $source = $data['_source'] ?? [];
+
+        return new self(
+            Carbon::parse($data['@timestamp'] ?? ''),
+            $data['_id'] ?? '',
+            SystemLogActorEntity::fromArray($source['actor'] ?? []),
+            SystemLogAuthenticationEntity::fromArray($source['authentication'] ?? []),
+            SystemLogEventEntity::fromArray($source['event'] ?? []),
+            array_map(fn ($t) => SystemLogTargetEntity::fromArray($t), $source['target'] ?? []),
+            $data['tag'] ?? ''
+        );
+    }
+}
diff --git a/src/Entities/System/SystemLogEventEntity.php b/src/Entities/System/SystemLogEventEntity.php
new file mode 100644
index 0000000..15302e0
--- /dev/null
+++ b/src/Entities/System/SystemLogEventEntity.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\Entities\System;
+
+use Carbon\Carbon;
+
+readonly class SystemLogEventEntity
+{
+    public function __construct(
+        public string $display_message,
+        public Carbon $published,
+        public string $reason,
+        public string $result,
+        public string $type
+    ) {}
+
+    /** @param  array<array-key, string>  $data */
+    public static function fromArray(array $data): self
+    {
+        return new self(
+            $data['display_message'] ?? '',
+            isset($data['published']) ? Carbon::createFromTimestampMs($data['published']) : Carbon::now(),
+            $data['reason'] ?? '',
+            $data['result'] ?? '',
+            $data['type'] ?? ''
+        );
+    }
+}
diff --git a/src/Entities/System/SystemLogTargetEntity.php b/src/Entities/System/SystemLogTargetEntity.php
new file mode 100644
index 0000000..ea64d87
--- /dev/null
+++ b/src/Entities/System/SystemLogTargetEntity.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\Entities\System;
+
+readonly class SystemLogTargetEntity
+{
+    public function __construct(
+        public string $alternate_id,
+        public string $alternate_name,
+        public string $display_name,
+        public string $id,
+        public string $type
+    ) {}
+
+    /** @param  array<string, string>  $data */
+    public static function fromArray(array $data): self
+    {
+        return new self(
+            $data['alternate_id'] ?? '',
+            $data['alternate_name'] ?? '',
+            $data['display_name'] ?? '',
+            $data['id'] ?? '',
+            $data['type'] ?? ''
+        );
+    }
+}
diff --git a/src/Entities/ResourceEntity.php b/src/Entities/Visitor/ResourceEntity.php
similarity index 94%
rename from src/Entities/ResourceEntity.php
rename to src/Entities/Visitor/ResourceEntity.php
index c8f440d..e61f711 100644
--- a/src/Entities/ResourceEntity.php
+++ b/src/Entities/Visitor/ResourceEntity.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Uxicodev\UnifiAccessApi\Entities;
+namespace Uxicodev\UnifiAccessApi\Entities\Visitor;
 
 use Uxicodev\UnifiAccessApi\API\Enums\ResourceType;
 use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
diff --git a/src/Entities/VisitorEntity.php b/src/Entities/Visitor/VisitorEntity.php
similarity index 97%
rename from src/Entities/VisitorEntity.php
rename to src/Entities/Visitor/VisitorEntity.php
index fdd8a37..f61f334 100644
--- a/src/Entities/VisitorEntity.php
+++ b/src/Entities/Visitor/VisitorEntity.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Uxicodev\UnifiAccessApi\Entities;
+namespace Uxicodev\UnifiAccessApi\Entities\Visitor;
 
 use Carbon\Carbon;
 use Illuminate\Support\Collection;
diff --git a/tests/API/Requests/System/SystemLogRequestTest.php b/tests/API/Requests/System/SystemLogRequestTest.php
new file mode 100644
index 0000000..8fff0da
--- /dev/null
+++ b/tests/API/Requests/System/SystemLogRequestTest.php
@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Uxicodev\UnifiAccessApi\Tests\API\Requests\System;
+
+use Carbon\Carbon;
+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
+{
+    public function test_from_array_success(): void
+    {
+        $data = [
+            'topic' => SystemLogTopic::DoorOpenings->value,
+            'since' => Carbon::now()->unix(),
+            'until' => Carbon::now()->addHour()->unix(),
+            'actor_id' => '8564ce90-76ba-445f-b78b-6cca39af0130',
+            'page_size' => 10,
+            'page_num' => 1,
+        ];
+        $request = SystemLogRequest::fromArray($data);
+        $this->assertInstanceOf(SystemLogRequest::class, $request);
+        $this->assertEquals($data['topic'], $request->topic->value);
+        $this->assertEquals($data['since'], $request->since->unix());
+        $this->assertEquals($data['until'], $request->until->unix());
+        $this->assertEquals($data['actor_id'], $request->actor_id->getValue());
+        $this->assertEquals($data['page_size'], $request->page_size);
+        $this->assertEquals($data['page_num'], $request->page_num);
+    }
+
+    public function test_from_array_validation_fails(): void
+    {
+        $data = [
+            // 'topic' is missing
+            'since' => Carbon::now()->unix(),
+        ];
+        $this->expectException(ValidationException::class);
+        $this->expectExceptionMessage('SystemLogRequest validation failed.');
+        SystemLogRequest::fromArray($data);
+    }
+
+    public function test_from_array_until_not_after_since(): void
+    {
+        $now = Carbon::now()->unix();
+        $data = [
+            'topic' => SystemLogTopic::DoorOpenings->value,
+            'since' => $now,
+            'until' => $now, // not after since
+        ];
+        $this->expectException(ValidationException::class);
+        $this->expectExceptionMessage('SystemLogRequest validation failed.');
+        try {
+            SystemLogRequest::fromArray($data);
+        } catch (ValidationException $e) {
+            $errors = $e->errors->toArray();
+            $this->assertArrayHasKey('until', $errors);
+            $this->assertStringContainsString("'until' must be after 'since'.", $errors['until'][0]);
+            throw $e;
+        }
+    }
+}
+
diff --git a/tests/API/Requests/Validators/SystemLogValidatorTest.php b/tests/API/Requests/Validators/SystemLogValidatorTest.php
new file mode 100644
index 0000000..06dc8d0
--- /dev/null
+++ b/tests/API/Requests/Validators/SystemLogValidatorTest.php
@@ -0,0 +1,85 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Uxicodev\UnifiAccessApi\Tests\API\Requests\Validators;
+
+use Carbon\Carbon;
+use PHPUnit\Framework\TestCase;
+use Uxicodev\UnifiAccessApi\API\Requests\Validators\SystemLogValidator;
+
+class SystemLogValidatorTest extends TestCase
+{
+    public function test_passes_with_all_required_fields(): void
+    {
+        $data = [
+            'topic' => 'DOOR_EVENT',
+            'since' => Carbon::now()->unix(),
+        ];
+        $validator = new SystemLogValidator($data);
+        $this->assertTrue($validator->passes());
+        $this->assertEmpty($validator->getErrors()->toArray());
+    }
+
+    public function test_fails_when_topic_missing(): void
+    {
+        $data = [
+            'since' => Carbon::now()->unix(),
+        ];
+        $validator = new SystemLogValidator($data);
+        $this->assertFalse($validator->passes());
+        $this->assertArrayHasKey('topic', $validator->getErrors()->toArray());
+    }
+
+    public function test_fails_when_since_missing(): void
+    {
+        $data = [
+            'topic' => 'DOOR_EVENT',
+        ];
+        $validator = new SystemLogValidator($data);
+        $this->assertFalse($validator->passes());
+        $this->assertArrayHasKey('since', $validator->getErrors()->toArray());
+    }
+
+    public function test_fails_when_both_required_fields_missing(): void
+    {
+        $data = [];
+        $validator = new SystemLogValidator($data);
+        $this->assertFalse($validator->passes());
+        $errors = $validator->getErrors()->toArray();
+        $this->assertArrayHasKey('topic', $errors);
+        $this->assertArrayHasKey('since', $errors);
+    }
+
+    public function test_fails_when_required_fields_are_empty(): void
+    {
+        $data = [
+            'topic' => '',
+            'since' => null,
+        ];
+        $validator = new SystemLogValidator($data);
+        $this->assertFalse($validator->passes());
+        $errors = $validator->getErrors()->toArray();
+        $this->assertArrayHasKey('topic', $errors);
+        $this->assertArrayHasKey('since', $errors);
+    }
+
+    public function test_fails_when_until_not_after_since(): void
+    {
+        $since = Carbon::now()->unix();
+        $until = $since; // 'until' is equal to 'since'
+        $data = [
+            'topic' => 'DOOR_EVENT',
+            'since' => $since,
+            'until' => $until,
+        ];
+        $validator = new SystemLogValidator($data);
+        $this->assertFalse($validator->passes());
+        $errors = $validator->getErrors()->toArray();
+        $this->assertArrayHasKey('until', $errors);
+        $this->assertStringContainsString(
+            "'until' must be after 'since'.",
+            $errors['until'][0]
+        );
+    }
+}
diff --git a/tests/API/SystemClientTest.php b/tests/API/SystemClientTest.php
new file mode 100644
index 0000000..3b854a0
--- /dev/null
+++ b/tests/API/SystemClientTest.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Uxicodev\UnifiAccessApi\Tests\API;
+
+use Carbon\Carbon;
+use GuzzleHttp\Client;
+use GuzzleHttp\Handler\MockHandler;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Psr7\Response;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+use Uxicodev\UnifiAccessApi\API\Enums\SystemLogTopic;
+use Uxicodev\UnifiAccessApi\API\Requests\System\SystemLogRequest;
+use Uxicodev\UnifiAccessApi\API\Responses\System\SystemLogsResponse;
+use Uxicodev\UnifiAccessApi\Client\Client as UnifiClient;
+use Uxicodev\UnifiAccessApi\Entities\System\SystemLogEntity;
+
+class SystemClientTest extends TestCase
+{
+    #[Test]
+    public function test_logs_returns_expected_response(): void
+    {
+        $mockHandler = new MockHandler([
+            new Response(200, [], file_get_contents(__DIR__.'/../fixtures/system/logs.json')),
+        ]);
+        $handlerStack = HandlerStack::create($mockHandler);
+        $client = new Client(['handler' => $handlerStack]);
+        $unifiClient = new UnifiClient($client);
+
+        $request = new SystemLogRequest(
+            topic: SystemLogTopic::DoorOpenings,
+            since: Carbon::createFromTimestamp(1690770546),
+            until: Carbon::createFromTimestamp(1690771546),
+            actor_id: null,
+            page_size: 1,
+            page_num: 25
+        );
+
+        $response = $unifiClient->system()->logs($request);
+
+        $this->assertInstanceOf(SystemLogsResponse::class, $response);
+        $this->assertEquals('SUCCESS', $response->code);
+        $this->assertEquals(1, $response->page);
+        $this->assertEquals(4, $response->total);
+        $this->assertNotEmpty($response->logs);
+        $firstLog = $response->logs->first();
+        $this->assertInstanceOf(SystemLogEntity::class, $firstLog);
+        $this->assertEquals('N/A', $firstLog->actor->display_name);
+        $this->assertEquals('NFC', $firstLog->authentication->credential_provider);
+        $this->assertEquals('Access Denied / Unknown (NFC)', $firstLog->event->display_message);
+        $this->assertEquals('BLOCKED', $firstLog->event->result);
+        $this->assertEquals('access.door.unlock', $firstLog->event->type);
+        $this->assertEquals('UA-HUB-3855', $firstLog->target[0]->display_name);
+        $this->assertEquals('access', $firstLog->tag);
+        $this->assertInstanceOf(Carbon::class, $firstLog->timestamp);
+        $this->assertInstanceOf(Carbon::class, $firstLog->event->published);
+    }
+}
diff --git a/tests/API/VisitorClientTest.php b/tests/API/VisitorClientTest.php
index 5e09701..e292b69 100644
--- a/tests/API/VisitorClientTest.php
+++ b/tests/API/VisitorClientTest.php
@@ -14,7 +14,7 @@
 use Uxicodev\UnifiAccessApi\API\Requests\Visitor\VisitorRequest;
 use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
 use Uxicodev\UnifiAccessApi\Client\Client as UnifiClient;
-use Uxicodev\UnifiAccessApi\Entities\VisitorEntity;
+use Uxicodev\UnifiAccessApi\Entities\Visitor\VisitorEntity;
 use Uxicodev\UnifiAccessApi\Exceptions\InvalidResponseException;
 use Uxicodev\UnifiAccessApi\Exceptions\UnifiApiErrorException;
 use Uxicodev\UnifiAccessApi\UnifiAccessApiServiceProvider;
@@ -222,6 +222,21 @@ public function a_failed_edit_throws_an_exception(): void
         ));
     }
 
+    #[Test]
+    public function assign_qr_code_returns_unifi_response(): void
+    {
+        $mockHandler = new MockHandler([
+            new Response(200, [], json_encode(['code' => 'SUCCESS', 'msg' => 'success'])),
+        ]);
+        $handlerStack = HandlerStack::create($mockHandler);
+        $client = new Client(['handler' => $handlerStack]);
+        $unifiClient = new UnifiClient($client);
+        $visitorId = new UuidV4('8564ce90-76ba-445f-b78b-6cca39af0130');
+        $response = $unifiClient->visitor()->assignQrCode($visitorId);
+        $this->assertEquals('SUCCESS', $response->code);
+        $this->assertEquals('success', $response->msg);
+    }
+
     #[Test]
     public function a_visitor_can_be_deleted(): void
     {
diff --git a/tests/Entities/ResourceEntityTest.php b/tests/Entities/ResourceEntityTest.php
index 6b581fd..08faa5c 100644
--- a/tests/Entities/ResourceEntityTest.php
+++ b/tests/Entities/ResourceEntityTest.php
@@ -6,7 +6,7 @@
 use PHPUnit\Framework\TestCase;
 use Uxicodev\UnifiAccessApi\API\Enums\ResourceType;
 use Uxicodev\UnifiAccessApi\API\ValueObjects\UuidV4;
-use Uxicodev\UnifiAccessApi\Entities\ResourceEntity;
+use Uxicodev\UnifiAccessApi\Entities\Visitor\ResourceEntity;
 
 class ResourceEntityTest extends TestCase
 {
diff --git a/tests/fixtures/system/logs.json b/tests/fixtures/system/logs.json
new file mode 100644
index 0000000..fc4b3cc
--- /dev/null
+++ b/tests/fixtures/system/logs.json
@@ -0,0 +1,43 @@
+{
+  "code": "SUCCESS",
+  "data": {
+    "hits": [
+      {
+        "@timestamp": "2023-07-11T12:11:27Z",
+        "_id": "",
+        "_source": {
+          "actor": {
+            "alternate_id": "",
+            "alternate_name": "",
+            "display_name": "N/A",
+            "id": "",
+            "type": "user"
+          },
+          "authentication": {
+            "credential_provider": "NFC",
+            "issuer": "6FC02554"
+          },
+          "event": {
+            "display_message": "Access Denied / Unknown (NFC)",
+            "published": 1689077487000,
+            "reason": "",
+            "result": "BLOCKED",
+            "type": "access.door.unlock"
+          },
+          "target": [
+            {
+              "alternate_id": "",
+              "alternate_name": "",
+              "display_name": "UA-HUB-3855",
+              "id": "7483c2773855",
+              "type": "UAH"
+            }
+          ]
+        },
+        "tag": "access"
+      }
+    ]
+  },
+  "page": 1,
+  "total": 4
+}
\ No newline at end of file