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diff --git a/lib/unstable/Federation/ISignedCloudFederationProvider.php b/lib/unstable/Federation/ISignedCloudFederationProvider.php
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index 00000000000..1ec50f606ae
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+++ b/lib/unstable/Federation/ISignedCloudFederationProvider.php
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+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\Federation;
+
+use OCP\Federation\ICloudFederationProvider;
+
+/**
+ * Interface ICloudFederationProvider
+ *
+ * Enable apps to create their own cloud federation provider
+ *
+ * @experimental 31.0.0
+ */
+interface ISignedCloudFederationProvider extends ICloudFederationProvider {
+
+	/**
+	 * returns federationId in direct relation (as recipient or as author) of a sharedSecret
+	 * the federationId must be the one at the remote end
+	 *
+	 * @param string $sharedSecret
+	 * @param array $payload
+	 *
+	 * @experimental 31.0.0
+	 * @return string
+	 */
+	public function getFederationIdFromSharedSecret(string $sharedSecret, array $payload): string;
+}