fix mode

Signed-off-by: Maurice Preuß <hello@envoyr.com>

src/Id/AnikeenId.php

@@ -66,11 +66,6 @@ class AnikeenId
      */
     private static string $refreshTokenField = 'anikeen_id_refresh_token';
 
-    /**
-     * Anikeen ID environment mode.
-     */
-    protected static ?string $mode = null;
-
     /**
      * Guzzle is used to make http requests.
      */
@@ -148,7 +143,7 @@ class AnikeenId
 
     public static function getMode(): string
     {
-        return config('services.anikeen.mode', 'production');
+        return config('services.anikeen.mode') ?: 'production';
     }
 
     public static function useRefreshTokenField(string $refreshTokenField): void