public function validate(Vanilla\Request $request, Vanilla\User $user = null, Vanilla\Config $config = null)
 {
     if ($request->getClientID() !== $config->getClientID()) {
         $clientID = $request->getClientID();
         $clientResponse = new Response\InvalidClientID($request);
         $clientResponse->setClientID($clientID);
         return $clientResponse;
     }
 }
 public function validate(Vanilla\Request $request, Vanilla\User $user = null, Vanilla\Config $config = null)
 {
     if (empty($request->getClientID())) {
         return new Response\MissingClientID($request);
     }
 }