diff --git a/src/HelloassoClient.php b/src/HelloassoClient.php
index 484d004..86a9d22 100644
--- a/src/HelloassoClient.php
+++ b/src/HelloassoClient.php
@@ -31,7 +31,7 @@ public function __construct(
         $this->checkout = new CheckoutIntentService($apiCaller, $organizationSlug);
         $this->directory = new DirectoryService();
         $this->payment = new PaymentService($apiCaller, $organizationSlug);
-        $this->order = new OrderService($apiCaller);
+        $this->order = new OrderService($apiCaller, $organizationSlug);
     }
 
     /**
diff --git a/src/Models/Statistics/OrderCollection.php b/src/Models/Statistics/OrderCollection.php
new file mode 100644
index 0000000..f53feac
--- /dev/null
+++ b/src/Models/Statistics/OrderCollection.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Helloasso\Models\Statistics;
+
+use Helloasso\Models\Common\Collection;
+
+/**
+ * @extends Collection<Order>
+ */
+class OrderCollection extends Collection
+{
+    /**
+     * Overriding the property with an @var annotation is needed for the
+     * serializer component until generics are not supported.
+     *
+     * @var Order[]
+     */
+    protected array $data = [];
+}
diff --git a/src/Service/OrderService.php b/src/Service/OrderService.php
index f3de50a..9d68590 100644
--- a/src/Service/OrderService.php
+++ b/src/Service/OrderService.php
@@ -6,14 +6,37 @@
 
 use Helloasso\Exception\HelloassoApiException;
 use Helloasso\Http\ApiCaller;
+use Helloasso\Models\Statistics\Order;
+use Helloasso\Models\Statistics\OrderCollection;
 
 class OrderService
 {
     public function __construct(
         private readonly ApiCaller $apiCaller,
+        private readonly string $organizationSlug,
     ) {
     }
 
+    /**
+     * @throws HelloassoApiException
+     */
+    public function retrieve(int $id): Order
+    {
+        return $this->apiCaller->get("/v5/orders/$id", Order::class);
+    }
+
+    /**
+     * @param array<string, mixed> $params
+     *
+     * @throws HelloassoApiException
+     */
+    public function all(array $params = []): OrderCollection
+    {
+        return $this->apiCaller->get("/v5/organizations/{$this->organizationSlug}/orders", OrderCollection::class, [
+            'query' => $params,
+        ]);
+    }
+
     /**
      * @throws HelloassoApiException
      */