diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c809d84bb..3f699e616 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -139,7 +139,7 @@ jobs:
     #     verbose: true
 
     - name: Upload logs as artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: mautic-logs
         path: var/logs/
diff --git a/Config/config.php b/Config/config.php
index 5e1ff6a39..c638a8866 100644
--- a/Config/config.php
+++ b/Config/config.php
@@ -185,6 +185,25 @@
                 'method'     => 'GET|POST',
             ],
         ],
+        'api' => [
+            'mautic_api_custom_item_unlink' => [
+                'path'         => '/custom/item/{itemId}/unlink/{contactId}',
+                'controller'   => 'CustomObjectsBundle:CustomItem\Api\Custom:unlink',
+                'method'       => 'DELETE',
+                'requirements' => [
+                    'itemId'    => '\d+',
+                    'contactId' => '\d+',
+                ],
+            ],
+            'mautic_api_custom_item_delete' => [
+                'path'         => '/custom/item/{itemId}/delete',
+                'controller'   => 'CustomObjectsBundle:CustomItem\Api\Custom:delete',
+                'method'       => 'DELETE',
+                'requirements' => [
+                    'itemId'    => '\d+',
+                ],
+            ],
+        ],
     ],
 
     'services' => [
@@ -408,6 +427,20 @@
                 ],
             ],
 
+            'custom_item.api_custom_controller' => [
+                'class'     => \MauticPlugin\CustomObjectsBundle\Controller\CustomItem\Api\CustomController::class,
+                'arguments' => [
+                    'mautic.custom.model.item',
+                    'custom_item.permission.provider',
+                    'translator',
+                ],
+                'methodCalls' => [
+                    'setContainer' => [
+                        '@service_container',
+                    ],
+                ],
+            ],
+
             // Custom Objects
             'custom_object.list_controller' => [
                 'class'     => \MauticPlugin\CustomObjectsBundle\Controller\CustomObject\ListController::class,
diff --git a/Controller/CustomItem/Api/CustomController.php b/Controller/CustomItem/Api/CustomController.php
new file mode 100644
index 000000000..446331849
--- /dev/null
+++ b/Controller/CustomItem/Api/CustomController.php
@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MauticPlugin\CustomObjectsBundle\Controller\CustomItem\Api;
+
+use MauticPlugin\CustomObjectsBundle\Controller\JsonController;
+use MauticPlugin\CustomObjectsBundle\Exception\ForbiddenException;
+use MauticPlugin\CustomObjectsBundle\Exception\NotFoundException;
+use MauticPlugin\CustomObjectsBundle\Model\CustomItemModel;
+use MauticPlugin\CustomObjectsBundle\Provider\CustomItemPermissionProvider;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+class CustomController extends JsonController
+{
+    private CustomItemModel $customItemModel;
+    private CustomItemPermissionProvider $permissionProvider;
+
+    public function __construct(
+        CustomItemModel $customItemModel,
+        CustomItemPermissionProvider $permissionProvider
+    ) {
+
+        $this->customItemModel = $customItemModel;
+        $this->permissionProvider = $permissionProvider;
+    }
+
+    public function unlinkAction(int $itemId, int $contactId): JsonResponse
+    {
+        try {
+            $customItem = $this->customItemModel->fetchEntity($itemId);
+
+            $this->permissionProvider->canEdit($customItem);
+
+            if ($customItem->getCustomObject()->getRelationshipObject()) {
+                try {
+                    $childCustomItem = $customItem->findChildCustomItem();
+                } catch (NotFoundException $e) {
+                }
+
+                if (isset($childCustomItem)) {
+                    $this->customItemModel->delete($childCustomItem);
+                }
+            }
+
+            $this->customItemModel->unlinkEntity($customItem, 'contact', $contactId);
+
+            return new JsonResponse(['success' => true]);
+
+        } catch (ForbiddenException|NotFoundException|\UnexpectedValueException $e) {
+            return new JsonResponse([
+                'message' => $e->getMessage(),
+                'success' => false,
+            ], $e->getCode());
+        }
+    }
+
+    public function deleteAction(int $itemId): Response
+    {
+        try {
+            $customItem = $this->customItemModel->fetchEntity($itemId);
+            $this->permissionProvider->canDelete($customItem);
+        } catch (NotFoundException|ForbiddenException $e) {
+            return new JsonResponse([
+                'message' => $e->getMessage(),
+                'success' => false,
+            ], Response::HTTP_NOT_FOUND);
+        }
+
+        $this->customItemModel->delete($customItem);
+
+        return new JsonResponse(['success' => true]);
+    }
+}
\ No newline at end of file
diff --git a/Tests/Functional/CustomApiControllerTest.php b/Tests/Functional/CustomApiControllerTest.php
new file mode 100644
index 000000000..558dc7394
--- /dev/null
+++ b/Tests/Functional/CustomApiControllerTest.php
@@ -0,0 +1,111 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MauticPlugin\CustomObjectsBundle\Tests\Functional;
+
+use Mautic\CoreBundle\Test\MauticMysqlTestCase;
+use Mautic\LeadBundle\Entity\Lead;
+use MauticPlugin\CustomObjectsBundle\Entity\CustomItem;
+use MauticPlugin\CustomObjectsBundle\Entity\CustomItemXrefContact;
+use MauticPlugin\CustomObjectsBundle\Entity\CustomObject;
+use MauticPlugin\CustomObjectsBundle\Repository\CustomItemRepository;
+use MauticPlugin\CustomObjectsBundle\Repository\CustomItemXrefContactRepository;
+
+final class CustomApiControllerTest extends MauticMysqlTestCase
+{
+    private ?CustomItemRepository $customItemRepository;
+    private ?CustomItemXrefContactRepository $customItemXrefContactRepository;
+    private Lead $contact;
+    private CustomItem $customItem;
+
+    protected function setUp(): void
+    {
+        $this->configParams['custom_objects_enabled'] = true;
+
+        parent::setUp();
+
+        $this->customItemRepository             = self::$container->get('custom_item.repository');
+        $this->customItemXrefContactRepository  = self::$container->get('custom_item.xref.contact.repository');
+
+        // Create a Contact
+        $this->contact = $this->createContact();
+        // Create a Custom Object
+        $customObject = $this->createCustomObject('Product', 'Products');
+        // Create a Custom Item
+        $this->customItem = $this->createCustomItem($customObject, 'Product 1');
+        // Relate CI with Contact
+        $this->createCustomItemXrefContact($this->customItem, $this->contact);
+    }
+
+    public function testDetachCustomItemFomContact(): void
+    {
+        $items = $this->customItemRepository->count([]);
+        $links = $this->customItemXrefContactRepository->count([]);
+        $this->assertEquals(1, $items);
+        $this->assertEquals(1, $links);
+
+        $this->client->request('DELETE', sprintf('/api/custom/item/%s/unlink/%s', $this->customItem->getId(), $this->contact->getId()));
+        $this->assertTrue($this->client->getResponse()->isOk());
+
+        $items = $this->customItemRepository->count([]);
+        $links = $this->customItemXrefContactRepository->count([]);
+        $this->assertEquals(1, $items);
+        $this->assertEquals(0, $links);
+    }
+
+    public function testDeleteCustomItem(): void
+    {
+        $items = $this->customItemRepository->count([]);
+        $links = $this->customItemXrefContactRepository->count([]);
+        $this->assertEquals(1, $items);
+        $this->assertEquals(1, $links);
+
+        $this->client->request('DELETE', sprintf('/api/custom/item/%s/delete', $this->customItem->getId()));
+        $this->assertTrue($this->client->getResponse()->isOk());
+
+        $items = $this->customItemRepository->count([]);
+        $links = $this->customItemXrefContactRepository->count([]);
+        $this->assertEquals(0, $items);
+        $this->assertEquals(0, $links);
+    }
+
+    private function createCustomObject(string $singular, string $plural): CustomObject
+    {
+        $customObject = new CustomObject();
+        $customObject->setNameSingular($singular);
+        $customObject->setNamePlural($plural);
+        $customObject->setAlias(mb_strtolower($plural));
+        $this->em->persist($customObject);
+        $this->em->flush();
+
+        return $customObject;
+    }
+
+    private function createContact(): Lead
+    {
+        $lead = new Lead();
+        $this->em->persist($lead);
+        $this->em->flush();
+
+        return $lead;
+    }
+
+    private function createCustomItem(CustomObject $customObject, string $name): CustomItem
+    {
+        $customItem = new CustomItem($customObject);
+        $customItem->setName($name);
+        $this->em->persist($customItem);
+        $this->em->flush();
+
+        return $customItem;
+    }
+
+    private function createCustomItemXrefContact(CustomItem $customItem, Lead $contact): void
+    {
+        $customItemXrefContact = new CustomItemXrefContact($customItem, $contact);
+
+        $this->em->persist($customItemXrefContact);
+        $this->em->flush();
+    }
+}