diff --git a/lib/Dav/PushSpec.php b/lib/Dav/PushSpec.php
new file mode 100644
index 0000000..f75b5d7
--- /dev/null
+++ b/lib/Dav/PushSpec.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\DavPush\Dav;
+
+abstract class PushSpec {
+
+	public const PUSH_PREFIX = '{https://bitfire.at/webdav-push}';
+
+	public const PUSH_MESSAGE = self::PUSH_PREFIX . 'push-message';
+
+	public const PROPERTY_PUSH_RESOURCE = self::PUSH_PREFIX . 'push-resource';
+	public const PROPERTY_TOPIC = self::PUSH_PREFIX . 'topic';
+	public const PROPERTY_TRANSPORTS = self::PUSH_PREFIX . 'transports';
+
+}
diff --git a/lib/Dav/ServiceDetectionPlugin.php b/lib/Dav/ServiceDetectionPlugin.php
index 234d265..2abdd13 100644
--- a/lib/Dav/ServiceDetectionPlugin.php
+++ b/lib/Dav/ServiceDetectionPlugin.php
@@ -27,6 +27,7 @@
 
 namespace OCA\DavPush\Dav;
 
+use OCA\DavPush\Dav\PushSpec;
 use OCA\DavPush\Transport\TransportManager;
 
 use OCP\IUser;
@@ -42,11 +43,6 @@
 
 class ServiceDetectionPlugin extends ServerPlugin {
 
-	public const PUSH_PREFIX = '{DAV:Push}';
-	public const PROPERTY_PUSH_TRANSPORTS = self::PUSH_PREFIX . 'push-transports';
-	public const PROPERTY_PUSH_TOPIC = self::PUSH_PREFIX . 'topic';
-
-
 	public function __construct(
 		private IUserSession $userSession,
 		private TransportManager $transportManager,
@@ -58,7 +54,7 @@ public function initialize(Server $server): void {
 	}
 
 	public function propFind(PropFind $propFind, INode $node) {
-		if (count(array_intersect([self::PROPERTY_PUSH_TRANSPORTS, self::PROPERTY_PUSH_TOPIC], $propFind->getRequestedProperties())) == 0) {
+		if (count(array_intersect([PushSpec::PROPERTY_TRANSPORTS, PushSpec::PROPERTY_TOPIC], $propFind->getRequestedProperties())) == 0) {
 			return;
 		}
 
@@ -67,7 +63,7 @@ public function propFind(PropFind $propFind, INode $node) {
 		}
 
 		$propFind->handle(
-			self::PROPERTY_PUSH_TRANSPORTS,
+			PushSpec::PROPERTY_TRANSPORTS,
 			function () use ($node) {
 				//$user = $this->userSession->getUser();
 				//if (!($user instanceof IUser)) {
@@ -80,9 +76,7 @@ function () use ($node) {
 				
 				foreach($transports as $transport) {
 					$result[] = [
-						(self::PUSH_PREFIX . "transport") => [
-							(self::PUSH_PREFIX . $transport->getId()) => $transport->getAdditionalInformation(),
-						]
+						(PushSpec::PUSH_PREFIX . $transport->getId()) => $transport->getAdditionalInformation(),
 					];
 				}
 
@@ -93,7 +87,7 @@ function () use ($node) {
 		);
 
 		$propFind->handle(
-			self::PROPERTY_PUSH_TOPIC,
+			PushSpec::PROPERTY_TOPIC,
 			//function () use ($node) {
 				//$user = $this->userSession->getUser();
 				//if (!($user instanceof IUser)) {
@@ -105,4 +99,4 @@ function () use ($node) {
 			$node->getName()
 		);
 	}
-}
\ No newline at end of file
+}
diff --git a/lib/Dav/SubscriptionManagementPlugin.php b/lib/Dav/SubscriptionManagementPlugin.php
index d3890de..5f81603 100644
--- a/lib/Dav/SubscriptionManagementPlugin.php
+++ b/lib/Dav/SubscriptionManagementPlugin.php
@@ -27,6 +27,7 @@
 
 namespace OCA\DavPush\Dav;
 
+use OCA\DavPush\Dav\PushSpec;
 use OCA\DavPush\Transport\TransportManager;
 use OCA\DavPush\Db\Subscription;
 use OCA\DavPush\Service\SubscriptionService;
@@ -103,7 +104,7 @@ private function parsePushRegisterElement(array $subElements) {
 		if(sizeof($errors) === 0) {
 			return [
 				"errors" => [],
-				"subscriptionType" => $parsedSubscriptionElement["type"],
+				"subscriptionType" => str_replace(PushSpec::PUSH_PREFIX, "", $parsedSubscriptionElement["type"]),
 				"subscriptionOptions" => $parsedSubscriptionElement["options"],
 				"requestedSubscriptionExpiration" => $parsedExpiresElement,
 			];
@@ -122,7 +123,7 @@ private function parseSubscriptionElement(array $subElements): array {
 		if(sizeof($subElements) == 1) {
 			// parse child element
 			$type = $subElements[0]["name"];
-			$type = preg_replace('/^\{DAV:Push\}/', '', $type);
+			$type = str_replace('{' . PushSpec::PUSH_PREFIX . '}', '', $type);
 			$type = preg_replace('/-subscription$/', '', $type);
 
 			$options = $subElements[0]["value"];
diff --git a/lib/PushTransports/WebPushTransport.php b/lib/PushTransports/WebPushTransport.php
index 644447f..535a804 100644
--- a/lib/PushTransports/WebPushTransport.php
+++ b/lib/PushTransports/WebPushTransport.php
@@ -26,6 +26,7 @@
 
 namespace OCA\DavPush\PushTransports;
 
+use OCA\DavPush\Dav\PushSpec;
 use OCA\DavPush\Transport\Transport;
 use OCA\DavPush\Service\WebPushSubscriptionService;
 use OCA\DavPush\Errors\WebPushSubscriptionNotFound;
@@ -43,7 +44,7 @@ private function parseOptions(array $options): array {
 		$result = [];
 
 		foreach($options as $option) {
-			if ($option["name"] == "{DAV:Push}push-resource") {
+			if ($option["name"] == PushSpec::PROPERTY_PUSH_RESOURCE) {
 				$result["pushResource"] = $option["value"];
 			}
 		}
@@ -85,8 +86,12 @@ public function notify(string $userId, string $collectionName, int $subscription
 
 		$pushResource = $this->webPushSubscriptionService->findBySubscriptionId($subscriptionId)->getPushResource();
 
-		$content = $xmlService->write('{DAV:Push}push-message', [
-			'{DAV:Push}topic' => $collectionName,
+		$content = $xmlService->write(PushSpec::PUSH_MESSAGE, [
+			'{DAV:}propstat' => [
+				'{DAV:}prop' => [
+					PushSpec::PROPERTY_TOPIC => $collectionName
+				]
+			],
 		]);
 
 		$options = [
diff --git a/lib/PushTransports/WebhookTransport.php b/lib/PushTransports/WebhookTransport.php
index c6d74b7..9a22374 100644
--- a/lib/PushTransports/WebhookTransport.php
+++ b/lib/PushTransports/WebhookTransport.php
@@ -26,6 +26,7 @@
 
 namespace OCA\DavPush\PushTransports;
 
+use OCA\DavPush\Dav\PushSpec;
 use OCA\DavPush\Transport\Transport;
 
 class WebhookTransport extends Transport {
@@ -35,7 +36,7 @@ public function registerSubscription($options) {
 		$url = False;
 
 		foreach($options as $option) {
-			if($option["name"] == "{DAV:Push}endpoint") {
+			if($option["name"] == "{" . PushSpec::PUSH_PREFIX . "}endpoint") {
 				$url = $option["value"];
 			}
 		}
@@ -65,4 +66,4 @@ public function notify(string $userId, string $collectionName, $data) {
 		$context = stream_context_create($options);
 		$result = file_get_contents($data["url"], false, $context);
 	}
-}
\ No newline at end of file
+}