Issue #2916252 by lawxen, wim leers, mglaman, skyredwang: [PP-1] Order's...

Issue #2916252 by lawxen, wim leers, mglaman, skyredwang: [PP-1] Order's Adjustment can't be normalized and serialized

Closes #2916252

modules/order/src/Normalizer/AdjustmentItemNormalizer.php

+<?php
+
+namespace Drupal\commerce_order\Normalizer;
+
+use CommerceGuys\Intl\Formatter\CurrencyFormatterInterface;
+use Drupal\commerce_order\Plugin\DataType\AdjustmentItem as AdjustmentItemDataType;
+use Drupal\serialization\Normalizer\NormalizerBase;
+
+class AdjustmentItemNormalizer extends NormalizerBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $supportedInterfaceOrClass = AdjustmentItemDataType::class;
+
+  /**
+   * AdjustmentItemNormalizer constructor.
+   *
+   * @param \CommerceGuys\Intl\Formatter\CurrencyFormatterInterface $currencyFormatter
+   *   The currency formatter.
+   */
+  public function __construct(protected CurrencyFormatterInterface $currencyFormatter) {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public function normalize($object, $format = NULL, array $context = []): array | bool | string | int | float | null | \ArrayObject {
+    assert($object instanceof AdjustmentItemDataType);
+    $adjustment_array = $object->getValue()->toArray();
+    $amount = &$adjustment_array['amount'];
+    $formatted_price = $this->currencyFormatter->format($amount->getNumber(), $amount->getCurrencyCode());
+    $amount = $amount->toArray();
+    $amount['formatted'] = $formatted_price;
+    return $adjustment_array;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSupportedTypes(?string $format): array {
+    return [AdjustmentItemDataType::class => TRUE];
+  }
+
+}