diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 8a1cd5514d4d6..f605e07609487 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -718,6 +718,7 @@
     'OCP\\Share\\IShare' => $baseDir . '/lib/public/Share/IShare.php',
     'OCP\\Share\\IShareHelper' => $baseDir . '/lib/public/Share/IShareHelper.php',
     'OCP\\Share\\IShareProvider' => $baseDir . '/lib/public/Share/IShareProvider.php',
+    'OCP\\Share\\IShareProviderSupportsAccept' => $baseDir . '/lib/public/Share/IShareProviderSupportsAccept.php',
     'OCP\\Share\\IShareProviderWithNotification' => $baseDir . '/lib/public/Share/IShareProviderWithNotification.php',
     'OCP\\Share_Backend' => $baseDir . '/lib/public/Share_Backend.php',
     'OCP\\Share_Backend_Collection' => $baseDir . '/lib/public/Share_Backend_Collection.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 7c824b34160e7..3be8b2cf648fb 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -751,6 +751,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\Share\\IShare' => __DIR__ . '/../../..' . '/lib/public/Share/IShare.php',
         'OCP\\Share\\IShareHelper' => __DIR__ . '/../../..' . '/lib/public/Share/IShareHelper.php',
         'OCP\\Share\\IShareProvider' => __DIR__ . '/../../..' . '/lib/public/Share/IShareProvider.php',
+        'OCP\\Share\\IShareProviderSupportsAccept' => __DIR__ . '/../../..' . '/lib/public/Share/IShareProviderSupportsAccept.php',
         'OCP\\Share\\IShareProviderWithNotification' => __DIR__ . '/../../..' . '/lib/public/Share/IShareProviderWithNotification.php',
         'OCP\\Share_Backend' => __DIR__ . '/../../..' . '/lib/public/Share_Backend.php',
         'OCP\\Share_Backend_Collection' => __DIR__ . '/../../..' . '/lib/public/Share_Backend_Collection.php',
diff --git a/lib/private/Share20/DefaultShareProvider.php b/lib/private/Share20/DefaultShareProvider.php
index 658353b9a26d5..366b9cad976b1 100644
--- a/lib/private/Share20/DefaultShareProvider.php
+++ b/lib/private/Share20/DefaultShareProvider.php
@@ -29,6 +29,7 @@
 use OCP\Share\Exceptions\ShareNotFound;
 use OCP\Share\IAttributes;
 use OCP\Share\IShare;
+use OCP\Share\IShareProviderSupportsAccept;
 use OCP\Share\IShareProviderWithNotification;
 use Psr\Log\LoggerInterface;
 use function str_starts_with;
@@ -38,7 +39,7 @@
  *
  * @package OC\Share20
  */
-class DefaultShareProvider implements IShareProviderWithNotification {
+class DefaultShareProvider implements IShareProviderWithNotification, IShareProviderSupportsAccept {
 	// Special share type for user modified group shares
 	public const SHARE_TYPE_USERGROUP = 2;
 
diff --git a/lib/private/Share20/Manager.php b/lib/private/Share20/Manager.php
index db129709cdab8..e76f4586dfded 100644
--- a/lib/private/Share20/Manager.php
+++ b/lib/private/Share20/Manager.php
@@ -44,6 +44,7 @@
 use OCP\Share\IProviderFactory;
 use OCP\Share\IShare;
 use OCP\Share\IShareProvider;
+use OCP\Share\IShareProviderSupportsAccept;
 use OCP\Share\IShareProviderWithNotification;
 use Psr\Log\LoggerInterface;
 
@@ -905,17 +906,17 @@ public function updateShare(IShare $share) {
 	 * @param IShare $share
 	 * @param string $recipientId
 	 * @return IShare The share object
-	 * @throws \InvalidArgumentException
+	 * @throws \InvalidArgumentException Thrown if the provider does not implement `IShareProviderSupportsAccept`
 	 * @since 9.0.0
 	 */
 	public function acceptShare(IShare $share, string $recipientId): IShare {
 		[$providerId,] = $this->splitFullId($share->getFullId());
 		$provider = $this->factory->getProvider($providerId);
 
-		if (!method_exists($provider, 'acceptShare')) {
-			// TODO FIX ME
+		if (!($provider instanceof IShareProviderSupportsAccept)) {
 			throw new \InvalidArgumentException('Share provider does not support accepting');
 		}
+		/** @var IShareProvider&IShareProviderSupportsAccept $provider */
 		$provider->acceptShare($share, $recipientId);
 
 		$event = new ShareAcceptedEvent($share);
diff --git a/lib/public/Share/IShareProvider.php b/lib/public/Share/IShareProvider.php
index c51bad8f9ef80..9d7c8013a36ec 100644
--- a/lib/public/Share/IShareProvider.php
+++ b/lib/public/Share/IShareProvider.php
@@ -44,16 +44,6 @@ public function create(\OCP\Share\IShare $share);
 	 */
 	public function update(\OCP\Share\IShare $share);
 
-	/**
-	 * Accept a share.
-	 *
-	 * @param IShare $share
-	 * @param string $recipient
-	 * @return IShare The share object
-	 * @since 17.0.0
-	 */
-	//	public function acceptShare(IShare $share, string $recipient): IShare;
-
 	/**
 	 * Delete a share
 	 *
diff --git a/lib/public/Share/IShareProviderSupportsAccept.php b/lib/public/Share/IShareProviderSupportsAccept.php
new file mode 100644
index 0000000000000..c3a0c2d0218dd
--- /dev/null
+++ b/lib/public/Share/IShareProviderSupportsAccept.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\Share;
+
+/**
+ * Interface IShareProviderSupportsAccept
+ *
+ * This interface allows to define IShareProvider that can handle the `acceptShare` method,
+ * which is available since Nextcloud 17.
+ *
+ * @since 30.0.0
+ */
+interface IShareProviderSupportsAccept extends IShareProvider {
+	/**
+	 * Accept a share.
+	 *
+	 * @param IShare $share
+	 * @param string $recipient
+	 * @return IShare The share object
+	 * @since 30.0.0
+	 */
+	public function acceptShare(IShare $share, string $recipient): IShare;
+}
diff --git a/lib/public/Share/IShareProviderWithNotification.php b/lib/public/Share/IShareProviderWithNotification.php
index afd1429c1f027..c2ba8118175a6 100644
--- a/lib/public/Share/IShareProviderWithNotification.php
+++ b/lib/public/Share/IShareProviderWithNotification.php
@@ -1,9 +1,8 @@
 <?php
 
 /**
- * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
- * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
- * SPDX-License-Identifier: AGPL-3.0-only
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 namespace OCP\Share;