diff --git a/src/Attribute/Channel.php b/src/Attribute/Channel.php
new file mode 100644
index 0000000..54e5585
--- /dev/null
+++ b/src/Attribute/Channel.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ferror\AsyncapiDocBundle\Attribute;
+
+use Attribute;
+use Ferror\AsyncapiDocBundle\Schema\V2\ChannelType;
+
+#[Attribute(Attribute::TARGET_CLASS)]
+readonly class Channel
+{
+    public function __construct(
+        public string $name,
+        public ChannelType $type = ChannelType::SUBSCRIBE,
+    ) {
+    }
+}
diff --git a/src/Attribute/Message.php b/src/Attribute/Message.php
index 28b5f40..4281773 100644
--- a/src/Attribute/Message.php
+++ b/src/Attribute/Message.php
@@ -5,19 +5,16 @@
 namespace Ferror\AsyncapiDocBundle\Attribute;
 
 use Attribute;
-use Ferror\AsyncapiDocBundle\Schema\V2\ChannelType;
 
 #[Attribute(Attribute::TARGET_CLASS)]
-class Message implements PropertyInterface
+readonly class Message implements PropertyInterface
 {
     /**
      * @param PropertyInterface[] $properties
      */
     public function __construct(
-        public readonly string $name,
-        public readonly string $channel,
-        public readonly array $properties = [],
-        public readonly ChannelType $channelType = ChannelType::SUBSCRIBE,
+        public string $name,
+        public array $properties = [],
     ) {
     }
 
@@ -25,9 +22,7 @@ public function toArray(): array
     {
         return [
             'name' => $this->name,
-            'channel' => $this->channel,
             'properties' => array_map(static fn(PropertyInterface $property) => $property->toArray(), $this->properties),
-            'channelType' => $this->channelType->value,
         ];
     }
 }
diff --git a/src/Attribute/Operation.php b/src/Attribute/Operation.php
new file mode 100644
index 0000000..c162007
--- /dev/null
+++ b/src/Attribute/Operation.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ferror\AsyncapiDocBundle\Attribute;
+
+use Attribute;
+use Ferror\AsyncapiDocBundle\Schema\V3\OperationType;
+
+#[Attribute(Attribute::TARGET_CLASS)]
+class Operation
+{
+    public function __construct(
+        public string $name,
+        public OperationType $type = OperationType::SEND,
+    ) {
+    }
+}
diff --git a/src/Schema/V3/InfoRenderer.php b/src/Schema/V3/InfoRenderer.php
index e04b0c5..9a0c4be 100644
--- a/src/Schema/V3/InfoRenderer.php
+++ b/src/Schema/V3/InfoRenderer.php
@@ -6,19 +6,12 @@
 
 final readonly class InfoRenderer
 {
-    public function __construct(
-        public string $title,
-        public string $description,
-        public string $version,
-    ) {
-    }
-
-    public function render(): array
+    public function render(array $document): array
     {
         return [
-            'title' => $this->title,
-            'version' => $this->version,
-            'description' => $this->description,
+            'title' => $document['title'],
+            'version' => $document['version'],
+            'description' => $document['description'],
         ];
     }
 }
diff --git a/tests/Unit/Schema/V3/InfoRendererTest.php b/tests/Unit/Schema/V3/InfoRendererTest.php
new file mode 100644
index 0000000..a98ad7c
--- /dev/null
+++ b/tests/Unit/Schema/V3/InfoRendererTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ferror\AsyncapiDocBundle\Tests\Unit\Schema\V3;
+
+use Ferror\AsyncapiDocBundle\Schema\V3\InfoRenderer;
+use PHPUnit\Framework\TestCase;
+
+final class InfoRendererTest extends TestCase
+{
+    public function testItRenders(): void
+    {
+        $renderer = new InfoRenderer();
+
+        $document = [];
+
+        $actual = $renderer->render($document);
+
+        $expected = [
+            'version' => '2.6.0',
+            'title' => 'Async API Title',
+            'description' => 'Async API Description',
+        ];
+
+        $this->assertEquals($expected, $actual);
+    }
+}
diff --git a/tests/Unit/Schema/V3/MessageRendererTest.php b/tests/Unit/Schema/V3/MessageRendererTest.php
new file mode 100644
index 0000000..dbdbe30
--- /dev/null
+++ b/tests/Unit/Schema/V3/MessageRendererTest.php
@@ -0,0 +1,148 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ferror\AsyncapiDocBundle\Tests\Unit\Schema\V3;
+
+use Ferror\AsyncapiDocBundle\Schema\V3\MessageRenderer;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Yaml\Yaml;
+
+class MessageRendererTest extends TestCase
+{
+    public function testReflection(): void
+    {
+        $document = [
+            'name' => 'UserSignedUp',
+            'properties' => [
+                [
+                    'name' => 'name',
+                    'type' => 'string',
+                    'required' => true,
+                ],
+                [
+                    'name' => 'email',
+                    'type' => 'string',
+                    'required' => true,
+                ],
+                [
+                    'name' => 'age',
+                    'type' => 'int',
+                    'required' => true,
+                ],
+                [
+                    'name' => 'isCitizen',
+                    'type' => 'bool',
+                    'required' => true,
+                ],
+            ],
+        ];
+
+        $schema = new MessageRenderer();
+
+        $specification = $schema->render($document);
+
+        $expectedSpecification = <<<YAML
+UserSignedUp:
+  payload:
+    type: object
+    properties:
+      name:
+        type: string
+      email:
+        type: string
+      age:
+        type: integer
+      isCitizen:
+        type: boolean
+    required:
+      - name
+      - email
+      - age
+      - isCitizen
+
+YAML;
+
+        $this->assertEquals($expectedSpecification, Yaml::dump($specification, 10, 2));
+    }
+
+    public function testAttributes(): void
+    {
+        $document = [
+            'name' => 'UserSignedUp',
+            'properties' => [
+                [
+                    'name' => 'name',
+                    'type' => 'string',
+                    'description' => 'Name of the user',
+                    'example' => 'John',
+                    'format' => 'string',
+                    'required' => true,
+                ],
+                [
+                    'name' => 'email',
+                    'type' => 'string',
+                    'description' => 'Email of the user',
+                    'format' => 'email',
+                    'example' => 'john@example.com',
+                    'required' => true,
+                ],
+                [
+                    'name' => 'age',
+                    'type' => 'integer',
+                    'description' => 'Age of the user',
+                    'format' => 'int',
+                    'example' => '18',
+                    'required' => true,
+                ],
+                [
+                    'name' => 'isCitizen',
+                    'type' => 'boolean',
+                    'description' => 'Is user a citizen',
+                    'format' => 'boolean',
+                    'example' => 'true',
+                    'required' => true,
+                ],
+            ],
+        ];
+
+        $schema = new MessageRenderer();
+
+        $specification = $schema->render($document);
+
+        $expectedSpecification = <<<YAML
+UserSignedUp:
+  payload:
+    type: object
+    properties:
+      name:
+        type: string
+        description: 'Name of the user'
+        format: string
+        example: John
+      email:
+        type: string
+        description: 'Email of the user'
+        format: email
+        example: john@example.com
+      age:
+        type: integer
+        description: 'Age of the user'
+        format: int
+        example: '18'
+      isCitizen:
+        type: boolean
+        description: 'Is user a citizen'
+        format: boolean
+        example: 'true'
+    required:
+      - name
+      - email
+      - age
+      - isCitizen
+
+YAML;
+
+        $this->assertEquals($expectedSpecification, Yaml::dump($specification, 10, 2));
+    }
+}
diff --git a/tests/Unit/Schema/V3/SchemaRendererTest.php b/tests/Unit/Schema/V3/SchemaRendererTest.php
new file mode 100644
index 0000000..c8269e9
--- /dev/null
+++ b/tests/Unit/Schema/V3/SchemaRendererTest.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ferror\AsyncapiDocBundle\Tests\Unit\Schema\V3;
+
+use Ferror\AsyncapiDocBundle\Schema\V3\SchemaRenderer;
+use PHPUnit\Framework\TestCase;
+
+final class SchemaRendererTest extends TestCase
+{
+    public function testItRenders(): void
+    {
+        $renderer = new SchemaRenderer();
+
+        $actual = $renderer->generate();
+
+        $expected = [];
+
+        $this->assertEquals($expected, $actual);
+    }
+}