public function issueToken(Request $Request, Response $Response)
    {
        try { // Handles `/(access|refresh)-token` endpoints.
            $AuthorizationServer = $this->authorizationServer();
            $Response            = $AuthorizationServer->respondToAccessTokenRequest($Request, $Response);
            $Response->output(['exit' => true]);
            //
        } catch (OAuthServerException $Exception) {
            $Response = $Exception->generateHttpResponse($Response);
            $Response->output(['exit' => true]);
            //
        } catch (\Throwable $Exception) {
            $Exception = new OAuthServerException($Exception->getMessage(), 0, 'unknown', 500);
            $Response  = $Exception->generateHttpResponse($Response);
            $Response->output(['exit' => true]);
        }
    }