diff --git a/src/OpenIDConnectServer.php b/src/OpenIDConnectServer.php
index 04b13f2..7c45285 100644
--- a/src/OpenIDConnectServer.php
+++ b/src/OpenIDConnectServer.php
@@ -106,11 +106,11 @@ private function expected_arguments_specification( $route ) {
 					),
 					'client_id'     => array(
 						'type'     => 'string',
-						'required' => true,
+						'required' => false,
 					),
 					'client_secret' => array(
 						'type'     => 'string',
-						'required' => true,
+						'required' => false,
 					),
 					'redirect_uri'  => array(
 						'type'     => 'string',