diff --git a/src/repository/order/OrderInterface.php b/src/repository/order/OrderInterface.php
new file mode 100644
index 0000000..4e0222e
--- /dev/null
+++ b/src/repository/order/OrderInterface.php
@@ -0,0 +1,20 @@
+<?php
+namespace repository\order;
+
+use entity\order\OrderInterface as OrderEntityInterface;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface OrderInterface
+{
+    public function saveOrder(OrderEntityInterface $order):void;
+    
+    /**
+     * This function just exists for maintaining reasons
+     */
+    public function deleteAllOrders():void;
+}
+
diff --git a/src/repository/product/ProductInterface.php b/src/repository/product/ProductInterface.php
new file mode 100644
index 0000000..c781d75
--- /dev/null
+++ b/src/repository/product/ProductInterface.php
@@ -0,0 +1,24 @@
+<?php
+namespace repository\product;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use entity\product\ProductInterface as ProductEntityInterface;
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface ProductInterface
+{
+    public function getAllProducts():ArrayCollection;
+    
+    /**
+     * Just exists for maintaining reasons ;)
+     */
+    public function deleteAllProducts():void;
+    
+    public function addProducts(ArrayCollection $products):void;
+    
+    public function getProductById(int $id):ProductEntityInterface;
+}
+
diff --git a/src/repository/user/UserInterface.php b/src/repository/user/UserInterface.php
new file mode 100644
index 0000000..69fd181
--- /dev/null
+++ b/src/repository/user/UserInterface.php
@@ -0,0 +1,22 @@
+<?php
+namespace repository\user;
+
+use entity\user\UserInterface as UserEntityInterface;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface UserInterface
+{
+    public function addUser(UserEntityInterface $user):void;
+    
+    /**
+     * This function just exist for maintaining reasons
+     */
+    public function deleteAllUsers():void;
+    
+    public function getUserByMailAndHash(string $mail,string $hash):UserEntityInterface;
+}
+