diff --git a/src/Domain/Article/Repository/ArticleRepositoryInterface.php b/src/Domain/Article/Repository/ArticleRepositoryInterface.php
new file mode 100644
index 0000000..634d1b4
--- /dev/null
+++ b/src/Domain/Article/Repository/ArticleRepositoryInterface.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Article\Repository;
+
+use App\Domain\Article\Article;
+use App\Domain\Article\ArticleStatus;
+use Symfony\Component\Uid\Uuid;
+
+interface ArticleRepositoryInterface
+{
+    public function findById(Uuid $id): ?Article;
+
+    public function findBySku(string $sku): ?Article;
+
+    public function findByInventoryNumber(string $inventoryNumber): ?Article;
+
+    /** @return list<Article> */
+    public function findByStatus(ArticleStatus $status): array;
+
+    public function decrementStockAtomic(Uuid $articleId): bool;
+
+    public function save(Article $article): void;
+
+    public function remove(Article $article): void;
+}
diff --git a/src/Domain/Article/Repository/ArticleTypeRepositoryInterface.php b/src/Domain/Article/Repository/ArticleTypeRepositoryInterface.php
new file mode 100644
index 0000000..2ddde25
--- /dev/null
+++ b/src/Domain/Article/Repository/ArticleTypeRepositoryInterface.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Article\Repository;
+
+use App\Domain\Article\ArticleType;
+use Symfony\Component\Uid\Uuid;
+
+interface ArticleTypeRepositoryInterface
+{
+    public function findById(Uuid $id): ?ArticleType;
+
+    public function findByName(string $name): ?ArticleType;
+
+    /** @return list<ArticleType> */
+    public function findAll(): array;
+
+    public function save(ArticleType $articleType): void;
+}
diff --git a/src/Domain/Channel/Repository/PlatformRepositoryInterface.php b/src/Domain/Channel/Repository/PlatformRepositoryInterface.php
new file mode 100644
index 0000000..26a9426
--- /dev/null
+++ b/src/Domain/Channel/Repository/PlatformRepositoryInterface.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Channel\Repository;
+
+use App\Domain\Channel\Platform;
+use Symfony\Component\Uid\Uuid;
+
+interface PlatformRepositoryInterface
+{
+    public function findById(Uuid $id): ?Platform;
+
+    public function findByType(string $type): ?Platform;
+
+    /** @return list<Platform> */
+    public function findAll(): array;
+
+    public function save(Platform $platform): void;
+}
diff --git a/src/Domain/Order/Repository/CustomerRepositoryInterface.php b/src/Domain/Order/Repository/CustomerRepositoryInterface.php
new file mode 100644
index 0000000..b50f4bc
--- /dev/null
+++ b/src/Domain/Order/Repository/CustomerRepositoryInterface.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Order\Repository;
+
+use App\Domain\Order\Customer;
+use Symfony\Component\Uid\Uuid;
+
+interface CustomerRepositoryInterface
+{
+    public function findById(Uuid $id): ?Customer;
+
+    public function findByPlatformId(string $platform, string $platformUserId): ?Customer;
+
+    public function findByMatchingKey(string $matchingKey): ?Customer;
+
+    public function save(Customer $customer): void;
+}
diff --git a/src/Domain/Order/Repository/OrderRepositoryInterface.php b/src/Domain/Order/Repository/OrderRepositoryInterface.php
new file mode 100644
index 0000000..bcefd74
--- /dev/null
+++ b/src/Domain/Order/Repository/OrderRepositoryInterface.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Order\Repository;
+
+use App\Domain\Order\Order;
+use Symfony\Component\Uid\Uuid;
+
+interface OrderRepositoryInterface
+{
+    public function findById(Uuid $id): ?Order;
+
+    public function findByPlatformOrderId(string $platformOrderId): ?Order;
+
+    public function save(Order $order): void;
+}