public function verifyResourceRequest(RequestInterface $request, ResponseInterface $response, $scope = null)
    {
        $token = $this->getAccessTokenData($request, $response);

        // Check if we have token data
        if (is_null($token)) {
            return false;
        }

        /**
         * Check scope, if provided
         * If token doesn't have a scope, it's null/empty, or it's insufficient, then throw 403
         * @see http://tools.ietf.org/html/rfc6750#section-3.1
         */
        if ($scope && (!isset($token["scope"]) || !$token["scope"] || !$this->scopeUtil->checkScope($scope, $token["scope"]))) {
            $response->setError(403, 'insufficient_scope', 'The request requires higher privileges than provided by the access token');
            $response->addHttpHeaders(array(
                'WWW-Authenticate' => sprintf('%s realm="%s", scope="%s", error="%s", error_description="%s"',
                    $this->tokenType->getTokenType(),
                    $this->config['www_realm'],
                    $scope,
                    $response->getParameter('error'),
                    $response->getParameter('error_description')
                )
            ));

            return false;
        }

        // allow retrieval of the token
        $this->token = $token;

        return (bool) $token;
    }