[CC-2868] Add chargeback webhook handling.

src/Services/ResourceService.php

@@ -209,6 +209,16 @@ public function fetchResourceByUrl($url)
                 }
                 $resource = $unzer->fetchReversal($paymentId, $resourceId);
                 break;
+            case $resourceType === IdStrings::CHARGEBACK:
+                $paymentId = IdService::getResourceIdFromUrl($url, IdStrings::PAYMENT);
+                $chargeId = IdService::getResourceIdOrNullFromUrl($url, IdStrings::CHARGE);
+
+                $resource = $this->fetchChargebackById(
+                    $paymentId,
+                    $resourceId,
+                    $chargeId
+                );
+                break;
             case $resourceType === IdStrings::PAYOUT:
                 $resource = $unzer->fetchPayout(IdService::getResourceIdFromUrl($url, IdStrings::PAYMENT));
                 break;

test/integration/WebhookTest.php

@@ -14,6 +14,7 @@
 use UnzerSDK\Constants\ApiResponseCodes;
 use UnzerSDK\Constants\WebhookEvents;
 use UnzerSDK\Exceptions\UnzerApiException;
+use UnzerSDK\Resources\TransactionTypes\Chargeback;
 use UnzerSDK\Resources\Webhook;
 use UnzerSDK\test\BaseIntegrationTest;
 use function count;
@@ -22,6 +23,7 @@
 class WebhookTest extends BaseIntegrationTest
 {
     //<editor-fold desc="Webhook tests">
+    const CHARGEDBACK_PAYMENT_ID = 's-pay-341196';
 
     /**
      * Verify Webhook resource can be registered and fetched.
@@ -221,6 +223,27 @@ public function bulkSettingOnlyOneWebhookShouldBePossible(): void
         $this->assertEquals($url, $webhook->getUrl());
     }
 
+    /**
+     * @test
+     */
+    public function testFetchResourceFromEvent(): void
+    {
+        $webhookNotification = [
+            'event' => 'chargebacks',
+            'publicKey' => 's-pub-xyz',
+            'retrieveUrl' => 'https://sbx-api.unzer.com/v1/payments/' . self::CHARGEDBACK_PAYMENT_ID . '/charges/s-chg-1/chargebacks/s-cbk-1',
+            'paymentId' => self::CHARGEDBACK_PAYMENT_ID
+        ];
+
+        // when
+        $chargeback = $this->unzer->fetchResourceFromEvent(json_encode($webhookNotification));
+
+        // then
+        $this->assertInstanceOf(Chargeback::class, $chargeback);
+        $this->assertNotNull($chargeback);
+        $this->assertEquals('s-cbk-1', $chargeback->getId());
+    }
+
     //</editor-fold>
 
     //<editor-fold desc="Helpers">

test/unit/Services/WebhooksServiceTest.php

@@ -11,16 +11,18 @@
 
 namespace UnzerSDK\test\unit\Services;
 
-use UnzerSDK\Unzer;
+use RuntimeException;
+use stdClass;
 use UnzerSDK\Interfaces\ResourceServiceInterface;
+use UnzerSDK\Resources\TransactionTypes\Charge;
+use UnzerSDK\Resources\TransactionTypes\Chargeback;
 use UnzerSDK\Resources\Webhook;
 use UnzerSDK\Resources\Webhooks;
 use UnzerSDK\Services\ResourceService;
 use UnzerSDK\Services\WebhookService;
 use UnzerSDK\test\BasePaymentTest;
 use UnzerSDK\test\unit\DummyResource;
-use RuntimeException;
-use stdClass;
+use UnzerSDK\Unzer;
 
 class WebhooksServiceTest extends BasePaymentTest
 {
@@ -328,6 +330,54 @@ public function fetchResourceByEventWithEmptyRetrieveUrlShouldThrowException():
         $webhookService->fetchResourceFromEvent();
     }
 
+    /**
+     * Verify that a chargeback is returned from a webhook event.
+     *
+     * @test
+     */
+    public function fetchChargebackByEventShouldReturnChargeback(): void
+    {
+        // given
+        $unzer = new Unzer('s-priv-1234');
+        $webhookService = new WebhookService($unzer);
+
+        $paymentId = 's-pay-42';
+        $chargeId = 's-chg-1';
+        $chargebackId = 's-cbk-1';
+        $retrieveUrl = "https://api.unzer.com/v1/payments/{$paymentId}/charges/{$chargeId}/chargebacks/{$chargebackId}";
+
+        // Partial mock: keep original behavior except fetchChargebackById which we want to intercept
+        $resourceServiceMock = $this->getMockBuilder(ResourceService::class)
+            ->setConstructorArgs([$unzer])
+            ->setMethods(['fetchChargebackById'])
+            ->getMock();
+
+        $chargeback = (new Chargeback(10.0))
+            ->setId($chargebackId)
+            ->setParentResource((new Charge())->setId($chargeId));
+
+        $resourceServiceMock->expects($this->once())
+            ->method('fetchChargebackById')
+            ->with($paymentId, $chargebackId, $chargeId)
+            ->willReturn($chargeback);
+
+        $webhookService->setResourceService($resourceServiceMock);
+
+        $eventJson = json_encode([
+            'event' => 'chargeback',
+            'publicKey' => 's-pub-xyz',
+            'retrieveUrl' => $retrieveUrl,
+            'paymentId' => $paymentId
+        ]);
+
+        // when
+        $fetchedChargeback = $webhookService->fetchResourceFromEvent($eventJson);
+
+        // then
+        $this->assertSame($chargeback, $fetchedChargeback);
+        $this->assertNotNull($fetchedChargeback);
+    }
+
     /**
      * Verify exception is thrown if the retrieveURL is empty.
      *