refactored code

Signed-off-by: Maurice Preuß (envoyr) <hello@envoyr.com>

src/Id/Resources/OrderItems.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+use Anikeen\Id\Concerns\HasBillable;
+use Anikeen\Id\Concerns\HasParent;
+use Anikeen\Id\Exceptions\RequestRequiresClientIdException;
+use Anikeen\Id\Result;
+use GuzzleHttp\Exception\GuzzleException;
+
+class OrderItems extends BaseCollection
+{
+    use HasBillable;
+    use HasParent;
+
+    /**
+     * Create a new order item for given order.
+     *
+     * VAT is calculated based on the billing address and shown in the order item response.
+     *
+     * @param string $orderId The order ID.
+     * @param array{
+     *      items: array<array{
+     *          type:        string,
+     *          name:        string,
+     *          description: string,
+     *          price:       float|int,
+     *          unit:        string,
+     *          units:       int
+     *      }>
+     *  } $attributes The order data:
+     *    - items:           Array of order items, each with type, name, description, price, unit, and quantity
+     * @throws RequestRequiresClientIdException
+     * @throws GuzzleException
+     */
+    public function create(string $orderId, array $attributes = []): OrderItem
+    {
+        return (new OrderItem($this->billable->request('POST', sprintf('v1/orders/%s', $orderId), $attributes)))
+            ->setBillable($this->billable)
+            ->setParent($this->parent);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function find(string $id): ?OrderItem
+    {
+        /** @var Result $result */
+        $result = $this->parent->request('GET', sprintf('v1/orders/%s/items/%s', $this->parent->id, $id));
+
+        return $result->success() ?
+            (new OrderItem($result))
+                ->setBillable($this->billable)
+                ->setParent($this->parent)
+            : null;
+    }
+}