diff --git a/ApnsPHP/Message/LiveActivity.php b/ApnsPHP/Message/LiveActivity.php
new file mode 100644
index 0000000..324d94c
--- /dev/null
+++ b/ApnsPHP/Message/LiveActivity.php
@@ -0,0 +1,259 @@
+<?php
+
+/**
+ * This file contains the LiveActivity class.
+ *
+ * SPDX-FileCopyrightText: Copyright 2024 Move Agency Group B.V., Zwolle, The Netherlands
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+namespace ApnsPHP\Message;
+
+use ApnsPHP\Message;
+use RuntimeException;
+use UnexpectedValueException;
+
+/**
+ * Live activity style message.
+ */
+class LiveActivity extends Message
+{
+    /**
+     * Content state information
+     * @var array<string,mixed>|object
+     */
+    private array|object $state;
+
+    /**
+     * Attributes at the start of an activity
+     * @var array<string,mixed>|object
+     */
+    private array|object $attributes;
+
+    /**
+     * Type of attributes
+     * @var string
+     */
+    private string $attributes_type;
+
+    /**
+     * Event for the activity
+     * @var LiveActivityEvent
+     */
+    private LiveActivityEvent $event;
+
+    /**
+     * Timestamp when the activity will become stale
+     * @var int
+     */
+    private int $stale_timestamp;
+
+    /**
+     * Timestamp when the activity will dismiss itself
+     * @var int
+     */
+    private int $dismiss_timestamp;
+
+    /**
+     * Constructor.
+     *
+     * @param string|null $deviceToken Recipients device token (optional).
+     */
+    public function __construct(?string $deviceToken = null)
+    {
+        parent::__construct($deviceToken);
+        parent::setPushType(PushType::LiveActivity);
+    }
+
+    /**
+     * Get the payload dictionary.
+     *
+     * @return array<string,mixed> The payload dictionary.
+     */
+    public function getPayloadDictionary(): array
+    {
+        $payload = parent::getPayloadDictionary();
+
+        $payload[self::APPLE_RESERVED_NAMESPACE]['event'] = $this->event->value;
+        $payload[self::APPLE_RESERVED_NAMESPACE]['timestamp'] = time();
+        if (isset($this->state)) {
+            $payload[self::APPLE_RESERVED_NAMESPACE]['content-state'] = $this->state;
+        }
+        if (isset($this->stale_timestamp)) {
+            $payload[self::APPLE_RESERVED_NAMESPACE]['stale-date'] = $this->stale_timestamp;
+        }
+        if (isset($this->dismiss_timestamp)) {
+            $payload[self::APPLE_RESERVED_NAMESPACE]['dismissal-date'] = $this->dismiss_timestamp;
+        }
+
+        if ($this->event !== LiveActivityEvent::Start) {
+            return $payload;
+        }
+
+        if (isset($this->attributes) && isset($this->attributes_type)) {
+            $payload[self::APPLE_RESERVED_NAMESPACE]['attributes-type'] = $this->attributes_type;
+            $payload[self::APPLE_RESERVED_NAMESPACE]['attributes'] = $this->attributes;
+        }
+
+        return $payload;
+    }
+
+    /**
+     * Set a topic
+     *
+     * @throws UnexpectedValueException if the topic is invalid for a live activity.
+     *
+     * @param string $topic
+     *
+     * @return void
+     */
+    public function setTopic(string $topic): void
+    {
+        if (!str_contains($topic, '.push-type.liveactivity')) {
+            throw new UnexpectedValueException("Topic '$topic' does not include '.push-type.liveactivity'!");
+        }
+
+        parent::setTopic($topic);
+    }
+
+    /**
+     * Set a push type
+     *
+     * @throws RuntimeException Since the push type is tied to the class
+     *
+     * @param PushType $pushType
+     *
+     * @return void
+     */
+    public function setPushType(PushType $pushType): void
+    {
+        throw new RuntimeException('Push type is enforced by the class!');
+    }
+
+    /**
+     * Set the event for the activity
+     *
+     * @param LiveActivityEvent $event The activity event
+     */
+    public function setEvent(LiveActivityEvent $event): void
+    {
+        $this->event = $event;
+    }
+
+    /**
+     * Get the event for the activity
+     * @return LiveActivityEvent
+     */
+    public function getEvent(): LiveActivityEvent
+    {
+        return $this->event;
+    }
+
+    /**
+     * Set the attributes for the start of the activity
+     *
+     * @param array<string,mixed>|object $attributes The attributes to set
+     */
+    public function setAttributes(array|object $attributes): void
+    {
+        $this->attributes = $attributes;
+    }
+
+    /**
+     * Get the attributes for the start activity
+     *
+     * @return object|array<string,mixed>
+     */
+    public function getAttributes(): object|array
+    {
+        return $this->attributes;
+    }
+
+    /**
+     * Set the attribute type for the start of the activity.
+     *
+     * @param string $type The attribute type
+     *
+     * @return void
+     */
+    public function setAttributesType(string $type): void
+    {
+        $this->attributes_type = $type;
+    }
+
+    /**
+     * Get the attribute type for the start of the activity.
+     *
+     * @return string The attribute type
+     */
+    public function getAttributesType(): string
+    {
+        return $this->attributes_type;
+    }
+
+    /**
+     * Set the timestamp when the information goes stale
+     *
+     * @param int $stale_timestamp The timestamp at which the information goes stale
+     *
+     * @return void
+     */
+    public function setStaleTimestamp(int $stale_timestamp): void
+    {
+        $this->stale_timestamp = $stale_timestamp;
+    }
+
+    /**
+     * Get the timestamp when the information goes stale
+     *
+     * @return int The timestamp at which the information goes stale
+     */
+    public function getStaleTimestamp(): int
+    {
+        return $this->stale_timestamp;
+    }
+
+    /**
+     * Set the timestamp when the activity dismisses itself
+     *
+     * @param int $dismiss_timestamp The timestamp at which the activity dismisses
+     *
+     * @return void
+     */
+    public function setDismissTimestamp(int $dismiss_timestamp): void
+    {
+        $this->dismiss_timestamp = $dismiss_timestamp;
+    }
+
+    /**
+     * Get the timestamp when the activity dismisses itself
+     *
+     * @return int The timestamp at which the activity dismisses
+     */
+    public function getDismissTimestamp(): int
+    {
+        return $this->dismiss_timestamp;
+    }
+
+    /**
+     * Set the content state
+     *
+     * @param array<string,mixed>|object $state The content state to relay to the app
+     *
+     * @return void
+     */
+    public function setContentState(array|object $state): void
+    {
+        $this->state = $state;
+    }
+
+    /**
+     * Get the content state
+     *
+     * @return array<string,mixed>|object The content state that should be relayed to the app
+     */
+    public function getContentState(): object|array
+    {
+        return $this->state;
+    }
+}
diff --git a/ApnsPHP/Message/LiveActivityEvent.php b/ApnsPHP/Message/LiveActivityEvent.php
new file mode 100644
index 0000000..3e6ebed
--- /dev/null
+++ b/ApnsPHP/Message/LiveActivityEvent.php
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * This file contains the LiveActivityEvent enum.
+ *
+ * SPDX-FileCopyrightText: Copyright 2024 Move Agency Group B.V., Zwolle, The Netherlands
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+namespace ApnsPHP\Message;
+
+/**
+ * Live activity events.
+ */
+enum LiveActivityEvent: string
+{
+    /**
+     * Indicates this message starts the live activity
+     */
+    case Start = 'start';
+
+    /**
+     * Indicates this message updates the live activity
+     */
+    case Update = 'update';
+
+    /**
+     * Indicates this message ends the live activity
+     */
+    case End = 'end';
+}
diff --git a/ApnsPHP/Message/Tests/LiveActivityGetPayloadDictionaryTest.php b/ApnsPHP/Message/Tests/LiveActivityGetPayloadDictionaryTest.php
new file mode 100644
index 0000000..3efb32c
--- /dev/null
+++ b/ApnsPHP/Message/Tests/LiveActivityGetPayloadDictionaryTest.php
@@ -0,0 +1,95 @@
+<?php
+
+/**
+ * This file contains the LiveActivityGetPayloadDictionaryTest class.
+ *
+ * SPDX-FileCopyrightText: Copyright 2024 Move Agency Group B.V., Zwolle, The Netherlands
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+namespace ApnsPHP\Message\Tests;
+
+use ApnsPHP\Message\LiveActivityEvent;
+
+/**
+ * This class contains tests for the getPayloadDictionary function
+ *
+ * @covers \ApnsPHP\Message
+ */
+class LiveActivityGetPayloadDictionaryTest extends LiveActivityTestBase
+{
+    /**
+     * Test that getPayloadDictionary returns complete payload
+     *
+     * @covers \ApnsPHP\Message::getPayloadDictionary
+     */
+    public function testGetPayloadDictionaryReturnsCompletePayload(): void
+    {
+        $this->mock_function('time', fn() => 1731944572);
+
+        $this->class->setTitle('Were no strangers to love');
+        $this->class->setText('You know the rules, and so do I');
+        $this->class->setCategory('something');
+        $this->class->setThreadId('thisIsAThreadId');
+        $this->class->setCustomProperty('property', 'property');
+        $this->class->setCustomProperty('name', 'value');
+        $this->class->setTopic('name.push-type.liveactivity');
+        $this->class->setEvent(LiveActivityEvent::Start);
+        $this->class->setContentState([]);
+        $this->class->setAttributes([]);
+        $this->class->setAttributesType('Type');
+        $this->class->setStaleTimestamp(1);
+        $this->class->setDismissTimestamp(2);
+
+        $payload = [
+            'aps' => [
+                'alert' => [
+                    'title' => 'Were no strangers to love',
+                    'body'  => 'You know the rules, and so do I'
+                ],
+                'category'          => 'something',
+                'thread-id'         => 'thisIsAThreadId',
+                'event'             => 'start',
+                'timestamp'         => 1731944572,
+                'content-state'     => [],
+                'stale-date'        => 1,
+                'dismissal-date'    => 2,
+                'attributes-type'   => 'Type',
+                'attributes'        => [],
+            ],
+            'property' => 'property',
+            'name' => 'value'
+        ];
+
+        $result = $this->get_reflection_method('getPayloadDictionary')
+                       ->invoke($this->class);
+
+        $this->assertEquals($payload, $result);
+        $this->unmock_function('time');
+    }
+
+    /**
+     * Test that getPayloadDictionary returns an empty payload if nothing is set
+     *
+     * @covers \ApnsPHP\Message::getPayloadDictionary
+     */
+    public function testGetPayloadDictionaryReturnsEmptyPayload(): void
+    {
+        $this->mock_function('time', fn() => 1731944572);
+
+        $this->class->setEvent(LiveActivityEvent::Start);
+
+        $payload = [
+            'aps' => [
+                'event'     => 'start',
+                'timestamp' => 1731944572
+            ]
+        ];
+
+        $result = $this->get_reflection_method('getPayloadDictionary')
+                       ->invoke($this->class);
+
+        $this->assertEquals($payload, $result);
+        $this->unmock_function('time');
+    }
+}
diff --git a/ApnsPHP/Message/Tests/LiveActivityGetTest.php b/ApnsPHP/Message/Tests/LiveActivityGetTest.php
new file mode 100644
index 0000000..d39a3bd
--- /dev/null
+++ b/ApnsPHP/Message/Tests/LiveActivityGetTest.php
@@ -0,0 +1,104 @@
+<?php
+
+/**
+ * This file contains the LiveActivityGetTest class.
+ *
+ * SPDX-FileCopyrightText: Copyright 2024 Move Agency Group B.V., Zwolle, The Netherlands
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+namespace ApnsPHP\Message\Tests;
+
+use ApnsPHP\Message\LiveActivityEvent;
+
+/**
+ * This class contains tests for the getter functions
+ *
+ * @covers \ApnsPHP\Message
+ */
+class LiveActivityGetTest extends LiveActivityTestBase
+{
+    /**
+     * Test that getEvent() gets the activity event.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::getEvent
+     */
+    public function testGetEvent(): void
+    {
+        $this->set_reflection_property_value('event', LiveActivityEvent::Start);
+
+        $value = $this->class->getEvent();
+
+        $this->assertSame(LiveActivityEvent::Start, $value);
+    }
+
+    /**
+     * Test that getAttributes() gets the activity attributes.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::getAttributes
+     */
+    public function testGetAttributes(): void
+    {
+        $this->set_reflection_property_value('attributes', []);
+
+        $value = $this->class->getAttributes();
+
+        $this->assertSame([], $value);
+    }
+
+    /**
+     * Test that getAttributes() gets the activity attributes type.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::getAttributesType
+     */
+    public function testGetAttributesType(): void
+    {
+        $this->set_reflection_property_value('attributes_type', 'Type');
+
+        $value = $this->class->getAttributesType();
+
+        $this->assertSame('Type', $value);
+    }
+
+    /**
+     * Test that getStaleTime() gets the activity stale time.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::getStaleTimestamp
+     */
+    public function testGetStaleTime(): void
+    {
+        $this->set_reflection_property_value('stale_timestamp', 1);
+
+        $value = $this->class->getStaleTimestamp();
+
+        $this->assertSame(1, $value);
+    }
+
+    /**
+     * Test that getDismissTime() gets the activity stale time.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::getDismissTimestamp
+     */
+    public function testGetDismissTime(): void
+    {
+        $this->set_reflection_property_value('dismiss_timestamp', 1);
+
+        $value = $this->class->getDismissTimestamp();
+
+        $this->assertSame(1, $value);
+    }
+
+    /**
+     * Test that getContentState() gets the activity state.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::getContentState
+     */
+    public function testGetContentState(): void
+    {
+        $this->set_reflection_property_value('state', []);
+
+        $value = $this->class->getContentState();
+
+        $this->assertSame([], $value);
+    }
+}
diff --git a/ApnsPHP/Message/Tests/LiveActivitySetTest.php b/ApnsPHP/Message/Tests/LiveActivitySetTest.php
new file mode 100644
index 0000000..84fdb3a
--- /dev/null
+++ b/ApnsPHP/Message/Tests/LiveActivitySetTest.php
@@ -0,0 +1,156 @@
+<?php
+
+/**
+ * This file contains the LiveActivitySetTest class.
+ *
+ * SPDX-FileCopyrightText: Copyright 2024 Move Agency Group B.V., Zwolle, The Netherlands
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+namespace ApnsPHP\Message\Tests;
+
+use ApnsPHP\Message\LiveActivityEvent;
+use ApnsPHP\Message\PushType;
+use RuntimeException;
+use UnexpectedValueException;
+
+/**
+ * This class contains tests for the setter functions
+ *
+ * @covers \ApnsPHP\Message
+ */
+class LiveActivitySetTest extends LiveActivityTestBase
+{
+    /**
+     * Get events to test with
+     *
+     * @return array<string,LiveActivityEvent[]> Arguments mapped to the event name
+     */
+    public static function eventDataProvider(): array
+    {
+        return [
+            LiveActivityEvent::Start->value  => [LiveActivityEvent::Start],
+            LiveActivityEvent::Update->value => [LiveActivityEvent::Update],
+            LiveActivityEvent::End->value    => [LiveActivityEvent::End],
+        ];
+    }
+
+    /**
+     * Test that setPushType() fails.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setPushType
+     */
+    public function testSetPushTypeFails(): void
+    {
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage("Push type is enforced by the class!");
+
+        $this->class->setPushType(PushType::LiveActivity);
+    }
+
+    /**
+     * Test that setTopic() sets the activity topic correctly.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setTopic
+     */
+    public function testSetTopicFailsOnInvalidTopic(): void
+    {
+        $this->expectException(UnexpectedValueException::class);
+        $this->expectExceptionMessage("Topic 'test' does not include '.push-type.liveactivity'!");
+
+        $this->class->setTopic('test');
+
+        $this->assertPropertySame('topic', 'test');
+    }
+
+    /**
+     * Test that setTopic() sets the activity topic.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setTopic
+     */
+    public function testSetTopic(): void
+    {
+        $this->class->setTopic('test.push-type.liveactivity');
+
+        $this->assertPropertySame('topic', 'test.push-type.liveactivity');
+    }
+
+    /**
+     * Test that setEvent() sets the activity event.
+     *
+     * @dataProvider eventDataProvider
+     *
+     * @param LiveActivityEvent $event The event to test with
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setEvent
+     */
+    public function testSetEvent(LiveActivityEvent $event): void
+    {
+        $this->class->setEvent($event);
+
+        $this->assertPropertySame('event', $event);
+    }
+
+    /**
+     * Test that setAttributes() sets the activity attributes.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setAttributes
+     */
+    public function testSetAttributes(): void
+    {
+        $this->class->setAttributes([]);
+        $this->assertPropertySame('attributes', []);
+
+        $object = (object) [];
+        $this->class->setAttributes($object);
+        $this->assertPropertySame('attributes', $object);
+    }
+
+    /**
+     * Test that testSetAttributesType() sets the activity attribute type.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setAttributesType
+     */
+    public function testSetAttributesType(): void
+    {
+        $this->class->setAttributesType('SomeType');
+        $this->assertPropertySame('attributes_type', 'SomeType');
+    }
+
+    /**
+     * Test that setStaleTime() sets the time the activity goes stale.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setStaleTimestamp
+     */
+    public function testSetStaleTime(): void
+    {
+        $this->class->setStaleTimestamp(1);
+        $this->assertPropertySame('stale_timestamp', 1);
+    }
+
+    /**
+     * Test that setDismissTime() sets the time the activity dismisses.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setDismissTimestamp
+     */
+    public function testSetDismissTime(): void
+    {
+        $this->class->setDismissTimestamp(1);
+        $this->assertPropertySame('dismiss_timestamp', 1);
+    }
+
+    /**
+     * Test that setContentState() sets the time the activity dismisses.
+     *
+     * @covers \ApnsPHP\Message\LiveActivity::setContentState
+     */
+    public function testSetContentState(): void
+    {
+        $this->class->setContentState([]);
+        $this->assertPropertySame('state', []);
+
+        $object = (object) [];
+        $this->class->setContentState($object);
+        $this->assertPropertySame('state', $object);
+    }
+}
diff --git a/ApnsPHP/Message/Tests/LiveActivityTestBase.php b/ApnsPHP/Message/Tests/LiveActivityTestBase.php
new file mode 100644
index 0000000..a2e7f30
--- /dev/null
+++ b/ApnsPHP/Message/Tests/LiveActivityTestBase.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * This file contains the LiveActivityTestBase class.
+ *
+ * SPDX-FileCopyrightText: Copyright 2024 Move Agency Group B.V., Zwolle, The Netherlands
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+namespace ApnsPHP\Message\Tests;
+
+use ApnsPHP\Message\LiveActivity;
+use Lunr\Halo\LunrBaseTest;
+
+/**
+ * This class contains common setup routines, providers
+ * and shared attributes for testing the Message class.
+ *
+ * @covers \ApnsPHP\Message\LiveActivity
+ */
+abstract class LiveActivityTestBase extends LunrBaseTest
+{
+    /**
+     * Class to test
+     * @var LiveActivity
+     */
+    protected LiveActivity $class;
+
+    /**
+     * TestCase constructor
+     */
+    public function setUp(): void
+    {
+        $this->class = new LiveActivity();
+        $this->baseSetUp($this->class);
+    }
+
+    /**
+     * TestCase destructor
+     */
+    public function tearDown(): void
+    {
+        parent::tearDown();
+        unset($this->class);
+    }
+}