diff --git a/appinfo/info.xml b/appinfo/info.xml
index 8b58db841..2e490ba6a 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -36,7 +36,7 @@
         <database min-version="9.4">pgsql</database>
         <database>sqlite</database>
         <database min-version="5.5">mysql</database>
-        <nextcloud min-version="18" max-version="21" />
+        <nextcloud min-version="20" max-version="21" />
     </dependencies>
     <background-jobs>
         <job>OCA\Deck\Cron\DeleteCron</job>
diff --git a/lib/AppInfo/Application20.php b/lib/AppInfo/Application20.php
index 2646e6424..80cd94b62 100644
--- a/lib/AppInfo/Application20.php
+++ b/lib/AppInfo/Application20.php
@@ -99,7 +99,9 @@ class Application20 extends App implements IBootstrap {
 		$context->injectFn(Closure::fromCallable([$this, 'registerCollaborationResources']));
 
 		$context->injectFn(function (IManager $shareManager) {
-			$shareManager->registerShareProvider(DeckShareProvider::class);
+			if (method_exists($shareManager, 'registerShareProvider')) {
+				$shareManager->registerShareProvider(DeckShareProvider::class);
+			}
 		});
 
 		$context->injectFn(function (Listener $listener, IEventDispatcher $eventDispatcher) {
diff --git a/lib/Sharing/ShareAPIHelper.php b/lib/Sharing/ShareAPIHelper.php
index 4b2dec7c4..31472000a 100644
--- a/lib/Sharing/ShareAPIHelper.php
+++ b/lib/Sharing/ShareAPIHelper.php
@@ -27,18 +27,27 @@ declare(strict_types=1);
 namespace OCA\Deck\Sharing;
 
 
+use OCA\Deck\Db\Acl;
 use OCA\Deck\Db\CardMapper;
+use OCA\Deck\NoPermissionException;
+use OCA\Deck\Service\PermissionService;
+use OCP\AppFramework\OCS\OCSNotFoundException;
+use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\IURLGenerator;
 use OCP\Share\IShare;
 
 class ShareAPIHelper {
 
 	private $urlGenerator;
+	private $timeFactory;
 	private $cardMapper;
+	private $permissionService;
 
-	public function __construct(IURLGenerator $urlGenerator, CardMapper $cardMapper) {
+	public function __construct(IURLGenerator $urlGenerator, ITimeFactory $timeFactory, CardMapper $cardMapper, PermissionService $permissionService) {
 		$this->urlGenerator = $urlGenerator;
+		$this->timeFactory = $timeFactory;
 		$this->cardMapper = $cardMapper;
+		$this->permissionService = $permissionService;
 	}
 
 	public function formatShare(IShare $share): array {