public function completeFlow(ClientEntity $client)
    {
        // Validate any scopes that are in the request
        $scopeParam = $this->server->getRequestHandler()->getParam('scope');
        $scopes = $this->validateScopes($scopeParam, $client);

        // Create a new session
        $session = new SessionEntity($this->server);
        $session->setOwner('client', $client->getId());
        $session->associateClient($client);

        // Generate an access token
        $accessToken = new AccessTokenEntity($this->server);
        $accessToken->setId();
        $accessToken->setExpireTime($this->getAccessTokenTTL() + time());

        // Associate scopes with the session and access token
        foreach ($scopes as $scope) {
            $session->associateScope($scope);
        }

        foreach ($session->getScopes() as $scope) {
            $accessToken->associateScope($scope);
        }

        // Save everything
        $session->save();
        $accessToken->setSession($session);
        $accessToken->save();

        $this->server->getTokenType()->setSession($session);
        $this->server->getTokenType()->setParam('access_token', $accessToken->getId());
        $this->server->getTokenType()->setParam('expires_in', $this->getAccessTokenTTL());

        return $this->server->getTokenType()->generateResponse();
    }