diff --git a/src/Domain/Channel/ArticleTypePlatformConfig.php b/src/Domain/Channel/ArticleTypePlatformConfig.php
new file mode 100644
index 0000000..e5d209a
--- /dev/null
+++ b/src/Domain/Channel/ArticleTypePlatformConfig.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Channel;
+
+use App\Domain\Article\ArticleType;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Uuid;
+
+#[ORM\Entity]
+#[ORM\Table(name: 'article_type_platform_configs', schema: 'app')]
+#[ORM\UniqueConstraint(columns: ['article_type_id', 'platform_id'])]
+class ArticleTypePlatformConfig
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'uuid')]
+    private Uuid $id;
+
+    #[ORM\ManyToOne(targetEntity: ArticleType::class)]
+    #[ORM\JoinColumn(nullable: false)]
+    private ArticleType $articleType;
+
+    #[ORM\ManyToOne(targetEntity: Platform::class)]
+    #[ORM\JoinColumn(nullable: false)]
+    private Platform $platform;
+
+    #[ORM\Column(type: 'string', length: 255)]
+    private string $categoryId;
+
+    /** @var Collection<int, AttributeMapping> */
+    #[ORM\OneToMany(mappedBy: 'platformConfig', targetEntity: AttributeMapping::class, cascade: ['persist', 'remove'])]
+    private Collection $attributeMappings;
+
+    public function __construct(ArticleType $articleType, Platform $platform, string $categoryId)
+    {
+        $this->id = Uuid::v7();
+        $this->articleType = $articleType;
+        $this->platform = $platform;
+        $this->categoryId = $categoryId;
+        $this->attributeMappings = new ArrayCollection();
+    }
+
+    public function getId(): Uuid { return $this->id; }
+    public function getArticleType(): ArticleType { return $this->articleType; }
+    public function getPlatform(): Platform { return $this->platform; }
+    public function getCategoryId(): string { return $this->categoryId; }
+    public function setCategoryId(string $categoryId): void { $this->categoryId = $categoryId; }
+
+    /** @return Collection<int, AttributeMapping> */
+    public function getAttributeMappings(): Collection { return $this->attributeMappings; }
+}
diff --git a/src/Domain/Channel/AttributeMapping.php b/src/Domain/Channel/AttributeMapping.php
new file mode 100644
index 0000000..b5e96a9
--- /dev/null
+++ b/src/Domain/Channel/AttributeMapping.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Channel;
+
+use App\Domain\Article\AttributeDefinition;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Uuid;
+
+#[ORM\Entity]
+#[ORM\Table(name: 'attribute_mappings', schema: 'app')]
+#[ORM\UniqueConstraint(columns: ['platform_config_id', 'attribute_definition_id'])]
+class AttributeMapping
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'uuid')]
+    private Uuid $id;
+
+    #[ORM\ManyToOne(targetEntity: ArticleTypePlatformConfig::class, inversedBy: 'attributeMappings')]
+    #[ORM\JoinColumn(nullable: false, onDelete: 'CASCADE')]
+    private ArticleTypePlatformConfig $platformConfig;
+
+    #[ORM\ManyToOne(targetEntity: AttributeDefinition::class)]
+    #[ORM\JoinColumn(nullable: false)]
+    private AttributeDefinition $attributeDefinition;
+
+    #[ORM\ManyToOne(targetEntity: ChannelField::class)]
+    #[ORM\JoinColumn(nullable: false)]
+    private ChannelField $channelField;
+
+    #[ORM\Column(type: 'string', length: 100, nullable: true)]
+    private ?string $transformer = null;
+
+    public function __construct(
+        ArticleTypePlatformConfig $platformConfig,
+        AttributeDefinition $attributeDefinition,
+        ChannelField $channelField,
+    ) {
+        $this->id = Uuid::v7();
+        $this->platformConfig = $platformConfig;
+        $this->attributeDefinition = $attributeDefinition;
+        $this->channelField = $channelField;
+    }
+
+    public function getId(): Uuid { return $this->id; }
+    public function getPlatformConfig(): ArticleTypePlatformConfig { return $this->platformConfig; }
+    public function getAttributeDefinition(): AttributeDefinition { return $this->attributeDefinition; }
+    public function getChannelField(): ChannelField { return $this->channelField; }
+    public function getTransformer(): ?string { return $this->transformer; }
+    public function setTransformer(?string $transformer): void { $this->transformer = $transformer; }
+}
diff --git a/src/Domain/Channel/ChannelField.php b/src/Domain/Channel/ChannelField.php
new file mode 100644
index 0000000..d7e9b1a
--- /dev/null
+++ b/src/Domain/Channel/ChannelField.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Channel;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Uuid;
+
+#[ORM\Entity]
+#[ORM\Table(name: 'channel_fields', schema: 'app')]
+class ChannelField
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'uuid')]
+    private Uuid $id;
+
+    #[ORM\ManyToOne(targetEntity: Platform::class)]
+    #[ORM\JoinColumn(nullable: false)]
+    private Platform $platform;
+
+    #[ORM\Column(type: 'string', length: 255)]
+    private string $label;
+
+    #[ORM\Column(type: 'string', length: 500)]
+    private string $path;
+
+    public function __construct(Platform $platform, string $label, string $path)
+    {
+        $this->id = Uuid::v7();
+        $this->platform = $platform;
+        $this->label = $label;
+        $this->path = $path;
+    }
+
+    public function getId(): Uuid { return $this->id; }
+    public function getPlatform(): Platform { return $this->platform; }
+    public function getLabel(): string { return $this->label; }
+    public function setLabel(string $label): void { $this->label = $label; }
+    public function getPath(): string { return $this->path; }
+    public function setPath(string $path): void { $this->path = $path; }
+}
diff --git a/src/Domain/Channel/Platform.php b/src/Domain/Channel/Platform.php
new file mode 100644
index 0000000..a44708c
--- /dev/null
+++ b/src/Domain/Channel/Platform.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Channel;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Uuid;
+
+#[ORM\Entity]
+#[ORM\Table(name: 'platforms', schema: 'app')]
+class Platform
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'uuid')]
+    private Uuid $id;
+
+    #[ORM\Column(type: 'string', length: 100, unique: true)]
+    private string $type;
+
+    #[ORM\Column(type: 'string', length: 255)]
+    private string $label;
+
+    /** @var array<string, mixed> */
+    #[ORM\Column(type: 'json')]
+    private array $config = [];
+
+    public function __construct(string $type, string $label)
+    {
+        $this->id = Uuid::v7();
+        $this->type = $type;
+        $this->label = $label;
+    }
+
+    public function getId(): Uuid { return $this->id; }
+    public function getType(): string { return $this->type; }
+    public function getLabel(): string { return $this->label; }
+    public function setLabel(string $label): void { $this->label = $label; }
+
+    /** @return array<string, mixed> */
+    public function getConfig(): array { return $this->config; }
+
+    /** @param array<string, mixed> $config */
+    public function setConfig(array $config): void { $this->config = $config; }
+}