diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f8c135..1de8048 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 Check our main [developer changelog](https://developer.paddle.com/?utm_source=dx&utm_medium=paddle-php-sdk) for information about changes to the Paddle Billing platform, the Paddle API, and other developer tools.
 
+## [1.7.2] - 2024-12-17
+
+### Fixed
+
+- Adjustment items can be omitted for when adjustment type is full
+
 ## [1.7.1] - 2024-12-13
 
 ### Fixed
diff --git a/examples/adjustments.php b/examples/adjustments.php
new file mode 100644
index 0000000..4f4a934
--- /dev/null
+++ b/examples/adjustments.php
@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+use Paddle\SDK\Entities\Shared\Action;
+use Paddle\SDK\Entities\Shared\AdjustmentType;
+use Paddle\SDK\Exceptions\ApiError;
+use Paddle\SDK\Exceptions\SdkExceptions\MalformedResponse;
+use Paddle\SDK\Resources\Adjustments\Operations\Create\AdjustmentItem;
+use Paddle\SDK\Resources\Adjustments\Operations\CreateAdjustment;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+$environment = Paddle\SDK\Environment::tryFrom(getenv('PADDLE_ENVIRONMENT') ?: '') ?? Paddle\SDK\Environment::SANDBOX;
+$apiKey = getenv('PADDLE_API_KEY') ?: null;
+$transactionId = getenv('PADDLE_TRANSACTION_ID') ?: null;
+$transactionItemId = getenv('PADDLE_TRANSACTION_ITEM_ID') ?: null;
+$fullAdjustmentTransactionId = getenv('PADDLE_FULL_ADJUSTMENT_TRANSACTION_ID') ?: null;
+
+if (is_null($apiKey)) {
+    echo "You must provide the PADDLE_API_KEY in the environment:\n";
+    echo "PADDLE_API_KEY=your-key php examples/basic_usage.php\n";
+    exit(1);
+}
+
+$paddle = new Paddle\SDK\Client($apiKey, options: new Paddle\SDK\Options($environment));
+
+// ┌───
+// │ Create Partial Adjustment │
+// └───────────────────────────┘
+try {
+    $partialAdjustment = $paddle->adjustments->create(
+        CreateAdjustment::partial(
+            Action::Refund(),
+            [
+                new AdjustmentItem(
+                    $transactionItemId,
+                    AdjustmentType::Partial(),
+                    '100',
+                ),
+            ],
+            'error',
+            $transactionId,
+        ),
+    );
+} catch (ApiError|MalformedResponse $e) {
+    var_dump($e);
+    exit;
+}
+
+echo sprintf("Partial Adjustment ID: %s\n", $partialAdjustment->id);
+
+// ┌───
+// │ Create Full Adjustment │
+// └────────────────────────┘
+try {
+    $fullAdjustment = $paddle->adjustments->create(
+        CreateAdjustment::full(
+            Action::Refund(),
+            'error',
+            $fullAdjustmentTransactionId,
+        ),
+    );
+} catch (ApiError|MalformedResponse $e) {
+    var_dump($e);
+    exit;
+}
+
+echo sprintf("Full Adjustment ID: %s\n", $fullAdjustment->id);
diff --git a/src/Client.php b/src/Client.php
index b8836ca..4a49986 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -60,7 +60,7 @@
 
 class Client
 {
-    private const SDK_VERSION = '1.7.1';
+    private const SDK_VERSION = '1.7.2';
 
     public readonly LoggerInterface $logger;
     public readonly Options $options;
diff --git a/src/Resources/Adjustments/Operations/CreateAdjustment.php b/src/Resources/Adjustments/Operations/CreateAdjustment.php
index 9b0ef41..f969ae9 100644
--- a/src/Resources/Adjustments/Operations/CreateAdjustment.php
+++ b/src/Resources/Adjustments/Operations/CreateAdjustment.php
@@ -22,21 +22,37 @@ class CreateAdjustment implements \JsonSerializable
      */
     public function __construct(
         public readonly Action $action,
-        public readonly array|Undefined $items,
+        public readonly array|Undefined|null $items,
         public readonly string $reason,
         public readonly string $transactionId,
         public readonly AdjustmentType|Undefined $type = new Undefined(),
     ) {
-        if ($this->type === AdjustmentType::Partial() && ($this->items instanceof Undefined || empty($this->items))) {
+        $typeIsFull = AdjustmentType::Full()->equals($this->type);
+
+        if (! $typeIsFull && ($this->items instanceof Undefined || empty($this->items))) {
             throw InvalidArgumentException::arrayIsEmpty('items');
         }
+
+        if ($typeIsFull && is_array($this->items)) {
+            throw new InvalidArgumentException('items are not allowed when the adjustment type is full');
+        }
+    }
+
+    public static function full(Action $action, string $reason, string $transactionId): self
+    {
+        return new self($action, new Undefined(), $reason, $transactionId, AdjustmentType::Full());
+    }
+
+    public static function partial(Action $action, array $items, string $reason, string $transactionId): self
+    {
+        return new self($action, $items, $reason, $transactionId, AdjustmentType::Partial());
     }
 
     public function jsonSerialize(): array
     {
-        $items = [];
+        if (is_array($this->items)) {
+            $items = [];
 
-        if (! $this->items instanceof Undefined) {
             foreach ($this->items as $item) {
                 $items[] = [
                     'item_id' => $item->itemId,
@@ -44,6 +60,8 @@ public function jsonSerialize(): array
                     'amount' => $item->amount,
                 ];
             }
+        } else {
+            $items = $this->items;
         }
 
         return $this->filterUndefined([
diff --git a/tests/Functional/Resources/Adjustments/AdjustmentsClientTest.php b/tests/Functional/Resources/Adjustments/AdjustmentsClientTest.php
index e154311..dfe5245 100644
--- a/tests/Functional/Resources/Adjustments/AdjustmentsClientTest.php
+++ b/tests/Functional/Resources/Adjustments/AdjustmentsClientTest.php
@@ -100,6 +100,43 @@ public static function createOperationsProvider(): \Generator
             new Response(200, body: self::readRawJsonFixture('response/full_entity')),
             self::readRawJsonFixture('request/create_full'),
         ];
+
+        yield 'Partial type with items' => [
+            CreateAdjustment::partial(
+                Action::Refund(),
+                [new AdjustmentItem(
+                    'txnitm_01h8bxryv3065dyh6103p3yg28',
+                    AdjustmentType::Partial(),
+                    '100',
+                )],
+                'error',
+                'txn_01h8bxpvx398a7zbawb77y0kp5',
+            ),
+            new Response(200, body: self::readRawJsonFixture('response/minimal_entity')),
+            self::readRawJsonFixture('request/create_type_partial_with_items'),
+        ];
+
+        yield 'Full type with no items' => [
+            CreateAdjustment::full(
+                Action::Refund(),
+                'error',
+                'txn_01h8bxpvx398a7zbawb77y0kp5',
+            ),
+            new Response(200, body: self::readRawJsonFixture('response/minimal_entity')),
+            self::readRawJsonFixture('request/create_type_full_with_no_items'),
+        ];
+
+        yield 'Full type with null items' => [
+            new CreateAdjustment(
+                Action::Refund(),
+                null,
+                'error',
+                'txn_01h8bxpvx398a7zbawb77y0kp5',
+                \Paddle\SDK\Entities\Adjustment\AdjustmentType::Full(),
+            ),
+            new Response(200, body: self::readRawJsonFixture('response/minimal_entity')),
+            self::readRawJsonFixture('request/create_type_full_with_null_items'),
+        ];
     }
 
     /**
diff --git a/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_full_with_no_items.json b/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_full_with_no_items.json
new file mode 100644
index 0000000..2c6d204
--- /dev/null
+++ b/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_full_with_no_items.json
@@ -0,0 +1,6 @@
+{
+    "action": "refund",
+    "type": "full",
+    "reason": "error",
+    "transaction_id": "txn_01h8bxpvx398a7zbawb77y0kp5"
+}
diff --git a/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_full_with_null_items.json b/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_full_with_null_items.json
new file mode 100644
index 0000000..09698c8
--- /dev/null
+++ b/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_full_with_null_items.json
@@ -0,0 +1,7 @@
+{
+    "action": "refund",
+    "type": "full",
+    "items": null,
+    "reason": "error",
+    "transaction_id": "txn_01h8bxpvx398a7zbawb77y0kp5"
+}
diff --git a/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_partial_with_items.json b/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_partial_with_items.json
new file mode 100644
index 0000000..7800085
--- /dev/null
+++ b/tests/Functional/Resources/Adjustments/_fixtures/request/create_type_partial_with_items.json
@@ -0,0 +1,13 @@
+{
+    "action": "refund",
+    "type": "partial",
+    "items": [
+        {
+            "item_id": "txnitm_01h8bxryv3065dyh6103p3yg28",
+            "type": "partial",
+            "amount": "100"
+        }
+    ],
+    "reason": "error",
+    "transaction_id": "txn_01h8bxpvx398a7zbawb77y0kp5"
+}
diff --git a/tests/Unit/Resources/Adjustments/Operations/CreateAdjustmentTest.php b/tests/Unit/Resources/Adjustments/Operations/CreateAdjustmentTest.php
new file mode 100644
index 0000000..1377f12
--- /dev/null
+++ b/tests/Unit/Resources/Adjustments/Operations/CreateAdjustmentTest.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Paddle\SDK\Tests\Unit\Resources\Adjustments\Operations;
+
+use Paddle\SDK\Entities\Adjustment\AdjustmentType;
+use Paddle\SDK\Entities\Shared\Action;
+use Paddle\SDK\Exceptions\SdkExceptions\InvalidArgumentException;
+use Paddle\SDK\Resources\Adjustments\Operations\CreateAdjustment;
+use Paddle\SDK\Undefined;
+use PHPUnit\Framework\TestCase;
+
+class CreateAdjustmentTest extends TestCase
+{
+    /**
+     * @test
+     *
+     * @dataProvider invalidItemsDataProvider
+     */
+    public function it_validates_items(array|Undefined|null $items, AdjustmentType $type, string $expectedExceptionMessage): void
+    {
+        self::expectException(InvalidArgumentException::class);
+        self::expectExceptionMessage($expectedExceptionMessage);
+
+        new CreateAdjustment(
+            Action::Refund(),
+            $items,
+            'error',
+            'txn_01h8bxpvx398a7zbawb77y0kp5',
+            $type,
+        );
+    }
+
+    public static function invalidItemsDataProvider(): \Generator
+    {
+        yield 'Empty' => [
+            [],
+            AdjustmentType::Partial(),
+            'items cannot be empty',
+        ];
+        yield 'Undefined' => [
+            new Undefined(),
+            AdjustmentType::Partial(),
+            'items cannot be empty',
+        ];
+        yield 'Null' => [
+            null,
+            AdjustmentType::Partial(),
+            'items cannot be empty',
+        ];
+        yield 'Items for full type' => [
+            [],
+            AdjustmentType::Full(),
+            'items are not allowed when the adjustment type is full',
+        ];
+    }
+}