diff --git a/src/Objects/ArticleInterface.php b/src/Objects/ArticleInterface.php
new file mode 100644
index 0000000..e386a78
--- /dev/null
+++ b/src/Objects/ArticleInterface.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Ardent\PicnicApi\Objects;
+
+interface ArticleInterface
+{
+    public function getId(): string;
+    public function getName(): string;
+    public function getImageId(): string;
+    public function getImageUrl(string $size): string;
+    public function getUnitQuantity(): string;
+    public function getUnitQuantitySub(): string;
+    public function getPrice(): float;
+    public function getMaxCount(): int;
+    public function getDecorators(): array;
+}
\ No newline at end of file
diff --git a/src/Objects/OrderArticle.php b/src/Objects/OrderArticle.php
index b79f203..908ccce 100644
--- a/src/Objects/OrderArticle.php
+++ b/src/Objects/OrderArticle.php
@@ -6,7 +6,7 @@ namespace Ardent\PicnicApi\Objects;
 
 use Ardent\PicnicApi\Client;
 
-class OrderArticle extends AbstractApiObject
+class OrderArticle extends AbstractApiObject implements ArticleInterface
 {
     /**
      * OrderArticle constructor.
@@ -14,10 +14,12 @@ class OrderArticle extends AbstractApiObject
     public function __construct(
         private string $id,
         private string $name,
-        private array $imageIds,
+        private array  $imageIds,
         private string $unitQuantity,
-        private int $price,
-        private int $maxCount,
+        private string $unitQuantitySub,
+        private int    $price,
+        private int    $maxCount,
+        private array  $decorators,
     )
     {
     }
@@ -34,22 +36,18 @@ class OrderArticle extends AbstractApiObject
             $apiObject['name'],
             $apiObject['image_ids'],
             $apiObject['unit_quantity'],
+            $apiObject['unit_quantity_sub'] ?? 'n/a',
             $apiObject['price'],
             $apiObject['max_count'],
+            $apiObject['decorators'],
         );
     }
 
-    /**
-     * @return string
-     */
     public function getId(): string
     {
         return $this->id;
     }
 
-    /**
-     * @return string
-     */
     public function getName(): string
     {
         return $this->name;
@@ -67,27 +65,38 @@ class OrderArticle extends AbstractApiObject
         }, $this->imageIds);
     }
 
-    /**
-     * @return string
-     */
+    public function getImageId(): string
+    {
+        return $this->imageIds[0];
+    }
+
+    public function getImageUrl(string $size = 'medium'): string
+    {
+        return Client::getImageUri($this->getImageId(), $size);
+    }
+
     public function getUnitQuantity(): string
     {
         return $this->unitQuantity;
     }
 
-    /**
-     * @return int
-     */
-    public function getPrice(): int
+    public function getUnitQuantitySub(): string
     {
-        return $this->price;
+        return $this->unitQuantitySub;
+    }
+
+    public function getPrice(): float
+    {
+        return $this->price / 100.0;
     }
 
-    /**
-     * @return int
-     */
     public function getMaxCount(): int
     {
         return $this->maxCount;
     }
+
+    public function getDecorators(): array
+    {
+        return $this->decorators;
+    }
 }
\ No newline at end of file
diff --git a/src/Objects/OrderLine.php b/src/Objects/OrderLine.php
index fd18202..02ba7c0 100644
--- a/src/Objects/OrderLine.php
+++ b/src/Objects/OrderLine.php
@@ -25,7 +25,7 @@ class OrderLine extends AbstractApiObject
 
     static public function fromApi(array $apiObject): AbstractApiObject
     {
-        dump($apiObject);
+//        dump($apiObject);
         return new self(
             $apiObject['id'],
             ApiListTransformer::getObjects($apiObject['items']),
diff --git a/src/Objects/SingleArticle.php b/src/Objects/SingleArticle.php
index 43a758e..8991f4a 100644
--- a/src/Objects/SingleArticle.php
+++ b/src/Objects/SingleArticle.php
@@ -6,7 +6,7 @@ namespace Ardent\PicnicApi\Objects;
 
 use Ardent\PicnicApi\Client;
 
-class SingleArticle extends AbstractApiObject
+class SingleArticle extends AbstractApiObject implements ArticleInterface
 {
     static public function getType(): string
     {
@@ -45,41 +45,26 @@ class SingleArticle extends AbstractApiObject
         );
     }
 
-    /**
-     * @return string
-     */
     public function getId(): string
     {
         return $this->id;
     }
 
-    /**
-     * @return string
-     */
     public function getName(): string
     {
         return $this->name;
     }
 
-    /**
-     * @return int
-     */
     public function getPrice(): float
     {
         return $this->price / 100.0;
     }
 
-    /**
-     * @return int
-     */
     public function getDisplayPrice(): float
     {
         return $this->displayPrice / 100.0;
     }
 
-    /**
-     * @return string
-     */
     public function getImageId(): string
     {
         return $this->imageId;
@@ -90,33 +75,21 @@ class SingleArticle extends AbstractApiObject
         return Client::getImageUri($this->imageId, $size);
     }
 
-    /**
-     * @return int
-     */
     public function getMaxCount(): int
     {
         return $this->maxCount;
     }
 
-    /**
-     * @return string
-     */
     public function getUnitQuantity(): string
     {
         return $this->unitQuantity;
     }
 
-    /**
-     * @return string
-     */
     public function getUnitQuantitySub(): string
     {
         return $this->unitQuantitySub;
     }
 
-    /**
-     * @return array
-     */
     public function getDecorators(): array
     {
         return $this->decorators;
diff --git a/src/Objects/SingleArticleDetails.php b/src/Objects/SingleArticleDetails.php
index 2e548c8..1178838 100644
--- a/src/Objects/SingleArticleDetails.php
+++ b/src/Objects/SingleArticleDetails.php
@@ -6,7 +6,7 @@ namespace Ardent\PicnicApi\Objects;
 
 use Ardent\PicnicApi\Client;
 
-class SingleArticleDetails extends AbstractApiObject
+class SingleArticleDetails extends AbstractApiObject implements ArticleInterface
 {
     static public function getType(): string
     {
@@ -47,7 +47,7 @@ class SingleArticleDetails extends AbstractApiObject
             $apiObject['unit_quantity_sub'] ?? 'n/a',
             $apiObject['decorators'],
             $apiObject['nutritional_values'],
-            $apiObject['ingredients_blob'],
+            $apiObject['ingredients_blob'] ?? '',
             $apiObject['additional_info'],
         );
     }
diff --git a/src/PicnicClient.php b/src/PicnicClient.php
index 3d3b36a..65f2cfc 100644
--- a/src/PicnicClient.php
+++ b/src/PicnicClient.php
@@ -35,6 +35,14 @@ class PicnicClient
         return ApiListTransformer::getObject($this->client->get(sprintf('product/%s', $productId))['product_details']);
     }
 
+    public function addProduct(string $productId, int $amount): Order
+    {
+        return ApiListTransformer::getObject($this->client->post('cart/add_product', [
+            'product_id' => $productId,
+            'count' => $amount,
+        ]));
+    }
+
     /**
      * Returns all past and current deliveries of the user.
      *