diff --git a/src/Client.php b/src/Client.php
index a143527..3344115 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -39,7 +39,7 @@ class Client
         );
     }
 
-    public function post(string $url, array $data): array
+    public function post(string $url, array $data): ?array
     {
         $data = $this->client->post($url, [
             RequestOptions::JSON => $data,
diff --git a/src/GrocyClient.php b/src/GrocyClient.php
index 4ddfe6f..d191265 100644
--- a/src/GrocyClient.php
+++ b/src/GrocyClient.php
@@ -8,6 +8,7 @@ use Ardent\GrocyApi\Objects\AbstractApiObject;
 use Ardent\GrocyApi\Objects\ObjectTransformer;
 use Ardent\GrocyApi\Objects\ProductsObject;
 use Ardent\GrocyApi\Objects\QuantityUnitsObject;
+use Ardent\GrocyApi\Objects\ShoppingListObject;
 
 class GrocyClient
 {
@@ -46,6 +47,14 @@ class GrocyClient
         return $this->getObjects('quantity_units');
     }
 
+    /**
+     * @return ShoppingListObject[]
+     */
+    public function getShoppingListProducts(): array
+    {
+        return $this->getObjects('shopping_list');
+    }
+
     public function getProduct(int $id): ProductsObject
     {
         return $this->getObject('products', $id);
@@ -78,6 +87,11 @@ class GrocyClient
         ]);
     }
 
+    public function getStockClient(): StockClient
+    {
+        return new StockClient($this->client);
+    }
+
     /**
      * @return AbstractApiObject[]
      */
diff --git a/src/Objects/ObjectTransformer.php b/src/Objects/ObjectTransformer.php
index 347f701..83fd616 100644
--- a/src/Objects/ObjectTransformer.php
+++ b/src/Objects/ObjectTransformer.php
@@ -12,19 +12,21 @@ use Symfony\Component\Serializer\Serializer;
 
 class ObjectTransformer
 {
-    private static function objectList(): array
+    private static function objectClass(string $name): string
     {
-        return [
+        return match ($name) {
             ProductsObject::getEntity() => ProductsObject::class,
             QuantityUnitsObject::getEntity() => QuantityUnitsObject::class,
-        ];
+            ShoppingListObject::getEntity() => ShoppingListObject::class,
+            default => null,
+        };
     }
 
     public static function denormalize($object, string $name): AbstractApiObject
     {
 //        $name = (new CamelCaseToSnakeCaseNameConverter())->denormalize($name);
 //        sprintf('%s\\%sObject', __NAMESPACE__, ucfirst($name))
-        return (new ObjectNormalizer())->denormalize($object, self::objectList()[$name]);
+        return (new ObjectNormalizer())->denormalize($object, self::objectClass($name));
     }
 
     public static function normalize(AbstractApiObject $object): array
diff --git a/src/Objects/ProductsObject.php b/src/Objects/ProductsObject.php
index 3de2750..63b9616 100644
--- a/src/Objects/ProductsObject.php
+++ b/src/Objects/ProductsObject.php
@@ -93,6 +93,11 @@ class ProductsObject extends AbstractApiObject
         return $this->userfields;
     }
 
+    public function getPicnicId(): ?int
+    {
+        return $this->getUserfields()['picnic'] ?? null;
+    }
+
     /**
      * @param array $userfields
      *
diff --git a/src/Objects/ShoppingListObject.php b/src/Objects/ShoppingListObject.php
new file mode 100644
index 0000000..e78c6d8
--- /dev/null
+++ b/src/Objects/ShoppingListObject.php
@@ -0,0 +1,158 @@
+<?php
+
+namespace Ardent\GrocyApi\Objects;
+
+class ShoppingListObject extends AbstractApiObject
+{
+    private int $product_id;
+
+    private ?string $note;
+
+    private int $amount;
+
+    private string $row_created_timestamp;
+
+    private int $shopping_list_id;
+
+    private int $done;
+
+    private int $qu_id;
+
+    public static function getEntity(): string
+    {
+        return 'shopping_list';
+    }
+
+    /**
+     * @return int
+     */
+    public function getProductId(): int
+    {
+        return $this->product_id;
+    }
+
+    /**
+     * @param int $product_id
+     *
+     * @return ShoppingListObject
+     */
+    public function setProductId(int $product_id): ShoppingListObject
+    {
+        $this->product_id = $product_id;
+        return $this;
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getNote(): ?string
+    {
+        return $this->note;
+    }
+
+    /**
+     * @param string|null $note
+     *
+     * @return ShoppingListObject
+     */
+    public function setNote(?string $note): ShoppingListObject
+    {
+        $this->note = $note;
+        return $this;
+    }
+
+    /**
+     * @return int
+     */
+    public function getAmount(): int
+    {
+        return $this->amount;
+    }
+
+    /**
+     * @param int $amount
+     *
+     * @return ShoppingListObject
+     */
+    public function setAmount(int $amount): ShoppingListObject
+    {
+        $this->amount = $amount;
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getRowCreatedTimestamp(): string
+    {
+        return $this->row_created_timestamp;
+    }
+
+    /**
+     * @param string $row_created_timestamp
+     *
+     * @return ShoppingListObject
+     */
+    public function setRowCreatedTimestamp(string $row_created_timestamp): ShoppingListObject
+    {
+        $this->row_created_timestamp = $row_created_timestamp;
+        return $this;
+    }
+
+    /**
+     * @return int
+     */
+    public function getShoppingListId(): int
+    {
+        return $this->shopping_list_id;
+    }
+
+    /**
+     * @param int $shopping_list_id
+     *
+     * @return ShoppingListObject
+     */
+    public function setShoppingListId(int $shopping_list_id): ShoppingListObject
+    {
+        $this->shopping_list_id = $shopping_list_id;
+        return $this;
+    }
+
+    /**
+     * @return int
+     */
+    public function getDone(): int
+    {
+        return $this->done;
+    }
+
+    /**
+     * @param int $done
+     *
+     * @return ShoppingListObject
+     */
+    public function setDone(int $done): ShoppingListObject
+    {
+        $this->done = $done;
+        return $this;
+    }
+
+    /**
+     * @return int
+     */
+    public function getQuId(): int
+    {
+        return $this->qu_id;
+    }
+
+    /**
+     * @param int $qu_id
+     *
+     * @return ShoppingListObject
+     */
+    public function setQuId(int $qu_id): ShoppingListObject
+    {
+        $this->qu_id = $qu_id;
+        return $this;
+    }
+}
\ No newline at end of file
diff --git a/src/StockClient.php b/src/StockClient.php
new file mode 100644
index 0000000..bf9c668
--- /dev/null
+++ b/src/StockClient.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Ardent\GrocyApi;
+
+class StockClient
+{
+    public function __construct(
+        private Client $client,
+    )
+    {
+    }
+
+    public function shoppingListAddMissingProducts(int $listId = 1): void
+    {
+        $this->client->post('stock/shoppinglist/add-missing-products', ['list_id' => $listId]);
+    }
+
+    public function shoppingListClear(int $listId = 1): void
+    {
+        $this->client->post('stock/shoppinglist/clear', ['list_id' => $listId]);
+    }
+
+    public function shoppingListAdd(int $productId, $amount, int $listId = 1, $note = ''): void
+    {
+        $this->client->post('stock/shoppinglist/clear', [
+            'product_id' => $productId,
+            'list_id' => $listId,
+            'product_amount' => $amount,
+            'note' => $note,
+        ]);
+    }
+
+    /**
+     * @return array array of StockLockEntry
+     */
+    public function stockAdd(int $productId, int $amount, string $price = "0.00", string $type = 'purchase', ?string $bestBeforeDate = null): array
+    {
+        $data = [
+            'amount' => $amount,
+            'transaction_type' => $type,
+            'price' => $price,
+        ];
+        if ($bestBeforeDate) {
+            $data['best_before_date'] = $bestBeforeDate; // "2019-01-19"
+        }
+        return $this->client->post(sprintf('stock/products/%s/add', $productId), $data);
+    }
+}
\ No newline at end of file