From 2fdf50127131531c32cc25078bb88c37563e4226 Mon Sep 17 00:00:00 2001
From: Shirish Maharjan <49825402+shirish71@users.noreply.github.com>
Date: Tue, 27 Sep 2022 14:53:25 +0545
Subject: [PATCH] Update OAuth2.php

---
 src/OAuth2.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/OAuth2.php b/src/OAuth2.php
index 5d066bb..cbdc7c0 100644
--- a/src/OAuth2.php
+++ b/src/OAuth2.php
@@ -130,7 +130,7 @@ public function getTenants(AccessTokenInterface $accessToken)
      * @param string|null $grantType
      * @return AccessTokenInterface
      */
-    public function refreshAccessToken(AccessTokenInterface $accessToken, string? $grantType = null)
+    public function refreshAccessToken(AccessTokenInterface $accessToken, ?string $grantType = null)
     {
         $body = [
             'refresh_token' => $accessToken->getRefreshToken()