diff --git a/Security/Services/AuthService.cs b/Security/Services/AuthService.cs
index 107b7e8..e13f565 100644
--- a/Security/Services/AuthService.cs
+++ b/Security/Services/AuthService.cs
@@ -8,4 +8,6 @@ public class AuthService()
 
     private static string GenerateRefreshToken() => Guid.NewGuid().ToString().Replace("-", "") +
                                                     GeneratorKey.GenerateString(32);
+
+    private static string GetAuthCacheKey(string fingerprint) => $"{fingerprint}_auth_token";
 }
\ No newline at end of file